Table Of Content

Canadian Journal Revue canadienne of Botany de botanique Contents Sommaire Volume 77, 1999 Volume 77, 1999 January / janvier ARTICLES Sigurd M. Sastad Genetic and environmental sources of variation in leaf morphology of Sphagnum fallax and Sphagnum isoviitae (Bryopsida): comparison of experiments conducted in the field and laboratory Ursula Eberhardt, Lutz Walter, and Ingrid Kottke Molecular and morphological discrimination between Tylospora fibrillosa and Tylospora asterophora mycorrhizae Masahiro Shishido and Christopher P. Chanway Spruce growth response specificity after treatment with plant growth-promoting Pseudomonads Adya P. Singh and Lloyd A. Donaldson Ultrastructure of tracheid cell walls in radiata pine (Pinus radiata) mild compression wood Lloyd A. Donaldson, Adya P. Singh, Arata Yoshinaga, and Keiji Takabe Lignin distribution in mild compression wood of Pinus radiata Montserrat Torrell, Maria Bosch, Joan Martin, and Joan Vallés Cytogenetic and isozymic characterization of the narrow endemic species Artemisia molinieri (Asteraceae, Anthemideae): implications for its systematics and conservation Luc Sirois, Yves Bégin, and Johanne Parent Female gametophyte and embryo development of black spruce along a shore— hinterland climatic gradient of a recently created reservoir, northern Quebec Isabel Santos, José Almeida, and Roberto Salema_ The influence of UV-B radiation on the superoxide dismutase of maize, potato, sorghum, and wheat leaves Hafedh Nasr, Tahar Sghaier, Mohamed Habib Ghorbal et Yvon René Dommergues Variabilité génotypique de l’aptitude a la fixation symbiotique de l’azote chez Acacia cyanophylla Lindl. Payam M. Fallah, J. Leland Crane, and Carol A. Shearer Freshwater ascomycetes: two new species of Ascotaiwania from North America Thomas R. Horton, Thomas D. Bruns, and V. Thomas Parker Ectomycorrhizal fungi associated with Arctostaphylos contrib- ute to Pseudotsuga menziesii establishment Rhomela F. Masangkay, Maxima O. Mabbayad, Timothy C. Paulitz, and Alan K. Watson Host range of Alternaria alter- nata f.sp. sphenocleae causing leaf blight of Sphenoclea zeylanica James L. Seago, Jr., Carol A. Peterson, and Daryl E. Enstone Cortical ontogeny in roots of the aquatic plant, Hydrocharis morsus-ranae L. James L. Seago, Jr., Carol A. Peterson, Daryl E. Enstone, and Chris A. Scholey Development of the endodermis and hypo- dermis of Typha glauca Godr. and Typha angustifolia L. roots M. Habte, Y.C. Zhang, and D.P. Schmitt Effectiveness of Glomus species in protecting white clover against nematode damage David E. Giblin and Clement W. Hamilton The relationship of reproductive biology to the rarity of endemic Aster curtus (Asteraceae) Gregory S. Saenz and John W. Taylor Phylogeny of the Erysiphales (powdery mildews) inferred from internal transcribed spacer ribosomal DNA sequences NOTES Chantal Morin, Julie Samson, and Michel Dessureault Protection of black spruce seedlings against Cylindrocladium root rot with ectomycorrhizal fungi H. Kriiger, A. Viljoen, and P.S. Van Wyk Histopathology of Albugo tragopogonis on stems and petioles of sunflower Jon H. Connolly, Walter C. Shortle, and Jody Jellison Translocation and incorporation of strontium carbonate derived strontium into calcium oxalate crystals by the wood decay fungus Resinicium bicolor C-2 Can. J. Bot. Vol. 77, 1999 Instructions to authors I-1 Pecommandations aux auteurs R-1 February / février ARTICLES Georges Barale Sur la présence d’une nouvelle espéce d’/soetites dans la flore du Crétacé inférieur de la région de Tataouine (Sud tunisien) : implications paléoclimatiques et phylogénétiques Norio Sahashi, Takanori Kubono, Yukiko Miyasawa, and Shin’ichiro Ito Temporal variations in isolation frequency of endo- phytic fungi of Japanese beech Héctor Godinez-Alvarez, Alfonso Valiente-Banuet, and Leopoldo Valiente Banuet Biotic interactions and the population dynamics of the long-lived columnar cactus Neobuxbaumia tetetzo in the Tehuacan Valley, Mexico Mei-Rong Li, David A. Wedin, and Larry L. Tieszen C3 and Cy, photosynthesis in Cyperus (Cyperaceae) in temperate eastern North America Teresa Valverde and Irene Pisanty Growth and vegetative spread of Schizachyrium scoparium var. littoralis (Poaceae) in sand dune microhabitats along a successional gradient Raffaela Vicaretti and Paul B.M. Joyce Comparison of mitochondrial and cytosolic tRNA nucleotidyltransferases from Triticum aestivum Bilquees Gul and Darrell J. Weber Effect of salinity, light, and temperature on germination in Allenrolfea occidentalis R. Kirschner and F. Oberwinkler A new Ophiostoma species associated with bark beetles infesting Norway spruce J.P. André, A.M. Catesson, and M. Liberman Characters and origin of vessels with heterogenous structure in leaf and flower abscission zones Michael J. Sumner, William R. Remphrey, and Richard Martin Pollen development in relation to phenological stages of inflorescence expansion in Amelanchier alnifolia (saskatoon), with a coniparison with buds forced out of dormancy Mark Vellend and Marcia J. Waterway Geographic patterns in the genetic diversity of a northern sedge, Carex rariflora Coralie R. Sopher, Marianna Kr6él, Norman P.A. Huner, Andrew E. Moore, and R. Austin Fletcher Chloroplastic changes associated with paclobutrazol-induced stress protection in maize seedlings Barbara S. Dyck and Jennifer M. Shay Biomass and carbon pool of two bogs in the Experimental Lakes Area, northwestern Ontario J.S. Yates, J.L. Golden, and J.F. Bain A preliminary phytogeographical analysis of inter- and intra-populational chloroplast DNA variation in Packera pseudaurea (Asteraceae: Senecioneae) from southwestern Alberta and adjacent Montana C. Wu and T. Hsiang Mycelial growth, sclerotial production and carbon utilization of three Typhula species Jacintha Miranda, Michele N. Konschuh, E.C. Yeung, and C.C. Chinnappa__In vitro plantlet regeneration from hypocotyl ex- plants of Stellaria longipes (Caryophyllaceae) March / mars ARTICLES Suzy Y. Rogiers and N. Richard Knowles A comparison of preharvest and postharvest ethylene production and respiration rates of saskatoon (Amelanchier alnifolia Nutt.) fruit during development J.A. Kolmer Virulence dynamics, phenotypic diversity, and virulence complexity in two populations of Puccinia triticina in Can- ada from 1987 to 1997 S. Moricca, A. Ragazzi, and K.R. Mitchelson Molecular and conventional detection and identification of Cladosporium tenuis- simum on two-needle pine rust aeciospores L.P.R. Bidel, M.R. Mannino, L.M. Riviere, and L. Pagés Tracing root development using the soft X-ray radiographic method, as applied to young cuttings of western red cedar (Thuja plicata) Gabriela S. Wyss and Heinz Miiller-Schaérer Infection process and resistance in the weed pathosystem Senecio vulgaris — Puccinia lagenophorae and implications for biological control Heather R. Kleb and Scott D. Wilson Scales of heterogeneity in prairie and forest Contents / Sommaire T. Dutoit, P. Roche et D. Alard Influence de perturbations anthropiques sur la composition et la diversité botanique des pelouses calcicoles de la vallée de la Seine en Haute-Normandie (France) Jin-Feng Chen, Jack E. Staub, Jeffrey W. Adelberg, and Jiming Jiang Physical mapping of 45S rRNA genes in Cucumis species by fluorescence in situ hybridization Peter A. Wilson, James S. Hanan, Peter M. Room, Sukumar Chakraborty, and David Doley Using Lindenmayer systems to model morphogenesis in a tropical pasture legume Stylosanthes scabra A. Herrera Effects of photoperiod and drought on the induction of crassulacean acid metabolism and the reproduction of plants of Talinum triangulare Giuseppe Bagatto and Joseph D. Shorthouse Biotic and abiotic characteristics of ecosystems on acid metalliferous mine tail- ings near Sudbury, Ontario Jerry G. Chmielewski Consequences of achene biomass, within-achene allocation patterns, and pappus on germination in ray and disc achenes of Aster umbellatus var. umbellatus (Asteraceae) John H. Markham and Chris P. Chanway Does past contact reduce the degree of mutualism in the Alnus rubra — Frankia symbiosis? A. Ignatov, Y. Kuginuki, and K. Hida Vascular stem resistance to black rot in Brassica oleracea Elisabeth Claire Robert, Line Rochefort, and Michelle Garneau Natural revegetation of two block-cut mined peatlands in eastern Canada Odette Rohfritsch A so called “rudimentary gall” induced by the gall midge Physemocecis hartigi on leaves of Tilia intermedia April / avril REVIEW / SYNTHESE Patricia A. Chambers, Robert E. DeWreede, Elizabeth A. Irlandi, and Herbert Vandermeulen Management issues in aquatic macrophyte ecology: a Canadian perspective ARTICLES Carol C. Baskin, Jerry M. Baskin, and Edward W. Chester Seed dormancy and germination in Rhexia mariana var. interior (Melastomataceae) and eco-evolutionary implications M.E. Galway, D.C. Lane, and J.W. Schiefelbein Defective control of growth rate and cell diameter in tip-growing root hairs of the rhd4 mutant of Arabidopsis thaliana Eric Imbert The effects of achene dimorphism on the dispersal in time and space in Crepis sancta (Asteraceae) Colin M. Orians, Daniel I. Bolnick, Bernadette M. Roche, Robert S. Fritz, and Ted Floyd Water availability alters the rela- tive performance of Salix sericea, Salix eriocephala, and their F, hybrids Susanna Puustinen and Veikko Salonen The effect of host defoliation on hemiparasitic—host interactions between Rhinanthus serotinus and two Poa species Patrick von Aderkas and Cathy Leary Ovular secretions in the micropylar canal of larches (Larix kaempferi and L. x euro- lepis) Carol L. Ecale Zhou and Elaine A. Backus Phloem injury and repair following potato leafhopper feeding on alfalfa stems B. Bucciarelli, M.E. Ostry, R.G. Fulcher, N.A. Anderson, and C.P. Vance Histochemical and microspectrophotometric analy- ses of early wound responses of resistant and susceptible Populus tremuloides inoculated with Entoleuca mammata (=Hypoxylon mammatum) Liza Peeters and @rjan Totland Wind to insect pollination ratios and floral traits in five alpine Salix species Jennifer A. Wilson and Darwyn S. Coxson Carbon flux in a subalpine spruce-—fir forest: pulse release from Hylocomium splen- dens feather-moss mats W. Wyatt Oswald, Linda B. Brubaker, and Patricia M. Anderson Late Quaternary vegetational history of the Howard Pass area, northwestern Alaska L.P. Ronse Decraene and E.F. Smets_ The floral development and anatomy of Carica papaya (Caricaceae) Jeffrey S. Carmichael and Sarena M. Selbo Ovule, embryo sac, embryo, and endosperm development in leafy spurge (Eu- Phorbia esula) Can. J. Bot. Vol. 77, 1999 May / mai ARTICLES Philip J. Villani and Darleen A. DeMason Roles of the Af and 7/ genes in pea leaf morphogenesis: leaf morphology and pinna anatomy of the heterozygotes L.C. Bliss and W.G. Gold Vascular plant reproduction, establishment, and growth and the effects of cryptogamic crusts within a polar desert ecosystem, Devon Island, N.W.T., Canada Stephan Imhof Subterranean structures and mycorrhiza of the achlorophyllous Burmannia tenella (Burmanniaceae) G.B. Ouellette, R.P. Baayen, M. Simard, and D. Rioux Ultrastructural and cytochemical study of colonization of xylem vessel elements of susceptible and resistant Dianthus caryophyllus by Fusarium oxysporum f.sp. dianthi Christian Bégin and Louise Filion Black spruce (Picea marianna) architecture Joélie Coulaud, Nasrine Barghi, Claude Lefebvre, and Sonja Siljak-Yakovley Cytogenetic variation in populations of Arme- ria maritima (Mill.) Willd. in relation to geographical distribution and soil stress tolerances J.P. Kociolek and J.C. Kingston Taxonomy, ultrastructure, and distribution of some gomphonemoid diatoms (Bacillariophyceae: Gomphonemataceae) from rivers in the United States Iris Meusel, Christoph Neinhuis, Claus Markstadter, and Wilhelm Barthlott Ultrastructure, chemical composition, and re- crystallization of epicuticular waxes: transversely ridged rodlets Philip Camill Patterns of boreal permafrost peatland vegetation across environmental gradients sensitive to climate warming Marc Santandreu and Francisco Lloret Effect of flowering phenology and habitat on pollen limitation in Erica multiflora Danielle Lobreau-Callen, Joél Jérémie et Maria Suarez-Cervera Morphologie et ultrastructure du pollen dans le genre Utri- cularia L. (Lentibulariaceae) ERRATA James L. Seago, Jr., Carol A. Peterson, and Daryl E. Enstone Erratum: Cortical ontogeny in roots of the aquatic plant, Hydrocharis morus-ranae L. Masahiro Shishido and Christopher P. Chanway Erratum: Spruce growth response specificity after treatment with plant growth-promoting Pseudomonads June / juin ARTICLES James W. Baxter, Steward T.A. Pickett, Margaret M. Carreiro, and John Dighton Ectomycorrhizal diversity and community structure in oak forest stands exposed to contrasting anthropogenic impacts Glenn R. Furnier, Allison M. Stolz, Raka M. Mustaphi, and Michael E. Ostry Genetic evidence that butternut canker was recently introduced into North America Gregory B. Allen, Kendrick J. Brown, and Richard J. Hebda Surface pollen spectra from southern Vancouver Island, British Columbia, Canada Abul Kalam Mohammed Ekramoddoullah, Yingchun Tan, Xueshu Yu, Doug William Taylor, and Santosh Misra _ Identifi- cation of a protein secreted by the blister rust fungus Cronartium ribicola in infected white pines and its cDNA cloning and characterization Tomas Rodriguez-Riaho, Ana Ortega-Olivencia, and Juan A. Devesa Reproductive biology in two Genisteae (Papilionoideae) endemic of the western Mediterranean region: Cytisus striatus and Retama sphaerocarpa René Le Cohu__Révision des principales espéces de Fragilariales (Bacillariophyta) des iles Kerguelen Pere Navarro-Rosinés, Claude Roux et André Bellemére Thelocarpella gordensis gen. et sp. nov. (Ascomycetes lichenisati, Acarosporaceae) Bradley R. Kropp, Gary R. Hooper, Dane R. Hansen, Mike Binns, and Sherman V. Thomson __ Initial events in the colonization of dyer’s woad by Puccinia thlaspeos Beom Seok Kim, Surk Sik Moon, and Byung Kook Hwang _ Isolation, identification, and antifungal activity of a macrolide antibiotic, oligomycin A, produced by Streptomyces libani Claude Lavoie and Annie Saint-Louis The spread of gray birch (Betula populifolia) in eastern Quebec: landscape and historical considerations Contents / Sommaire Jon Moen, Par K. Ingvarsson, and David W.H. Walton Estimates of structural complexity in clonal plant morphology: com- parisons of grazed and ungrazed Acaena magellanica rhizomes Santiago Ortiz Three new scapose species of Vernonia Schreb. (Asteraceae, Vernonieae) from Angola A.M. Farnet, M. Roux, and J. Le Petit Genotypic variations among isolates of Marasmius quercophilus, a white-rot fungus isolated from evergreen oak litter Alexandra Pinior, Urs Wyss, Yves Piché, and Horst Vierheilig Plants colonized by AM fungi regulate further root colonization by AM fungi through altered root exudation Leonard J. Hutchison Wood-inhabiting microfungi isolated from Populus tremuloides from Alberta and northeastern British Co- lumbia Monica Marcinko Kuehn and Bradley N. White Morphological analysis of genetically identified cattails Typha latifolia, Typha angustifolia, and Typha xglauca July / juillet DISCUSSION Kevin P. Timoney Threatened dry grasslands in the continental boreal forests of Wood Buffalo National Park: commentary A.G. Schwarz and Ross W. Wein Dry grasslands in Wood Buffalo National Park: reply ARTICLES Charles B. Halpern, Shelley A. Evans, and Sarah Nielson Soil seed banks in young, closed-canopy forests of the Olympic Peninsula, Washington: potential contributions to understory reinitiation Ann L. Lezberg, Joseph A. Antos, and Charles B. Halpern Belowground traits of herbaceous species in young coniferous forests of the Olympic Peninsula, Washington Nobuharu Goto and Richard P. Pharis_ Role of gibberellins in the development of floral organs of the gibberellin-deficient mutant, gal-1, of Arabidopsis thaliana Alexander Lux, Miroslava Luxova, Shigenori Morita, Jun Abe, and Shinobu Inanaga Endodermal silicification in develop- ing seminal roots of lowland and upland cultivars of rice (Oryza sativa L.) Oussama Ahrazem, Begoiia G6mez-Miranda, Alicia Prieto, Isabel Barasoain, Manuel Bernabé, and J. Antonio Leal Struc- tural characterization of a cell wall polysaccharide from Penicillium vermoesenii: chemotaxonomic application Massimiliano Tattini and Riccardo Gucci [onic relations of Phillyrea latifolia L. plants during NaCl stress and relief from stress Xiaojie Li, Jerry M. Baskin, and Carol C. Baskin Contrasting dispersal phenologies in two fleshy-fruited congeneric shrubs, Rhus aromatica Ait. and Rhus glabra L. (Anacardiaceae) B. Foggi, G. Rossi, and M.A. Signorini The Festuca violacea aggregate (Poaceae) in the Alps and Apennines (central southern Europe) John Paul Schmit, John F. Murphy, and Gregory M. Mueller Macrofungal diversity of a temperate oak forest: a test of species richness estimators T.P. McGonigle, J.P. Hovius, and R.L. Peterson Arbuscular mycorrhizae of American ginseng (Panax quinquefolius) in culti- vated field plots: plant age affects the development of a colonization lag phase Rong-Cai Yang, Zhihong Ye, and Yasu Hiratsuka Susceptibility of Pinus contorta — Pinus banksiana complex to Endocronar- tium harknessii: host-pathogen interactions F. Jailloux, L. Willocquet, L. Chapuis, and G. Froidefond Effect of weather factors on the release of ascospores of Uncinula necator, the cause of grape powdery mildew, in the Bordeaux region August / aoait ARTICLES H.B. Massicotte, R. Molina, L.E. Tackaberry, J.E. Smith, and M.P. Amaranthus Diversity and host specificity of ectomycorrhizal fungi retrieved from three adjacent forest sites by five host species Peter Lesica and Scott Miles Russian olive invasion into cottonwood forests along a regulated river in north-central Montana Lori A. Gom and Stewart B. Rood The discrimination of cottonwood clones in a mature grove along the Oldman River in southern Alberta C-6 Can. J. Bot. Vol. 77, Lori A. Gom and Stewart B. Rood Patterns of clonal occurrence in a mature cottonwood grove along the Oldman River, Alberta B-humil Mandak and Petr PySek How does density and nutrient stress affect allometry and fruit production in the heterocarpic species Atriplex sagittata (Chenopodiaceae)? Stephen R. Downie and Deborah S. Katz-Downie Phylogenetic analysis of chloroplast rps16 intron sequences reveals relationships within the woody southern African Apiaceae subfamily Apioideae André-Jean Francez et Pierre Loiseau§ Devenir de |’azote minéral dans une tourbiére a Sphagnum fallax Klinggr. et Carex rostrata Stokes du Massif central (France) Paul M. Catling and Vivian R. Brownell Platanthera lacera x leucophaea, a new cryptic natural hybrid, and a key to northeastern North American fringed-orchids R.D. Wulff, H.F. Causin, O. Benitez, and P.A. Bacalini Intraspecific variability and maternal effects in the response to nutrient addition in Chenopodium album Yoh-ichi Matsubara, Yukari Uetake, and R. Larry Peterson Entry and colonization of Asparagus officinalis roots by arbuscular mycorrhizal fungi with emphasis on changes in host microtubules L. Lardet, G. Piombo, F. Oriol, E. Dechamp, and M.P. Carron Relations between biochemical characteristics and conversion ability in Hevea brasiliensis zygotic and somatic embryos Ming-Qiu Yu and Wen-Hsiung Ko The inheritance of mating type and growth rate in Choanephora cucurbitarum NOTES E.A. Johnson, K. Miyanishi, and N. O’Brien Long-term reconstruction of the fire season in the mixedwood boreal forest of Western Canada C. Gurusamy The pattern of seed formation in cauliflower (Brassica oleracea L. var. botrytis) with special reference to seed abor- tion J.M. Kranabetter, S. Hayden, and E.F. Wright A comparison of ectomycorrhiza communities from three conifer species planted on forest gap edges J. Mitchell McGrath and Leslie G. Hickok Multiple ribosomal RNA gene loci in the genome of the homosporous fern Cera- topteris richardii September / septembre THE 11TH INTERNATIONAL CONFERENCE ON FRANKIA AND ACTINORHIZAL PLANTS / [11° CONFERENCE INTERNATIONALE SUR LES FRANKIA ET LES PLANTES ACTINORHIZIENNES] University of Illinois at Urbana-Champaign, Illinois, U.S.A., June 7-11, 1998 / University of Illinois at Urbana-Champaign, Illinois, U.S.A., 7-11 juin 1998 J.O. Dawson Foreword / Préambule ARTICLES Michael L. Clawson, Jeffrey Gawronski, and David R. Benson Dominance of Frankia strains in stands of Alnus incana subsp. rugosa and Myrica pensylvanica 1203 Nancy J. Ritchie and David D. Myrold Phylogenetic placement of uncultured Ceanothus microsymbionts using 16S rRNA gene sequences 1208 Néstor-Octavio Pérez, Hiram Olivera, Luis Vasquez, and Maria Valdés Genetic characterization of Mexican Frankia strains nodulating Casuarina equisetifolia 1214 Soon-Chun Jeong and David D. Myrold Genomic fingerprinting of Frankia microsymbionts from Ceanothus copopulations using repetitive sequences and polymerase chain reactions 1220 Anja Nickel, Dittmar Hahn, Kornelia Zepp, and Josef Zeyer In situ analysis of introduced Frankia populations in root nodules of Alnus glutinosa grown under different water availability 1231 R. Nalin, P. Normand, P. Simonet, and A.M. Domenach Polymerase chain reaction and hybridization on DNA extracted from soil as a tool for Frankia spp. population distribution studies in soil 1239 J.F. Zimpfer, G.J. Kennedy, C.A. Smyth, J. Hamelin, E. Navarro, and J.O. Dawson Localization of Casuarina-infective Frankia near Casuarina cunninghamiana trees in Jamaica 1248 Louis S. Tisa, Matthew S. Chval, Glenn D. Krumholz, and Joel Richards Antibiotic resistance patterns of Frankia strains 1257 Contents / Sommaire Erica Lumini and Marco Bosco Polymerase chain reaction — restriction fragment length polymorphisms for assessing and in- creasing biodiversity of Frankia culture collections Ho Bang Kim and Chung Sun An __ Isolation and characterization of a cDNA clone encoding polyubiquitin from the root nodule of Elaeagnus umbellata Won Young Yoo, Si Bum Sung, and Chung Sun An_ Nucleotide sequences of the 2-oxoacid ferredoxin oxidoreductase and ferredoxin genes from Frankia strain EulK1, a symbiont of Elaeagnus umbellata root nodules Neil R. McEwan and Derek Gatherer Codon indices as a predictor of gene functionality in a Frankia operon Héléne Cérémonie, Frédéric Debellé, and Maria P. Fernandez Structural and functional comparison of Frankia root hair de- forming factor and rhizobia Nod factor Claudio Valverde and Luis Gabriel Wall Regulation of nodulation in Discaria trinervis (Rhamnaceae) — Frankia symbiosis M. Hughes, C. Donnelly, A. Crozier, and C.T. Wheeler Effects of the exposure of roots of Alnus glutinosa to light on flavonoids and nodulation Gregory L. Boyer, Stacie A. Kane, Jeffrey A. Alexander, and Dallas B. Aronson Siderophore formation in iron-limited cul- tures of Frankia sp. strain 52065 and Frankia sp. strain CeSI5 J.M. Igual and J.O. Dawson Stimulatory effects of aluminum on in vitro growth of Frankia R. Howard Berg Frankia forms infection threads R. Howard Berg, Birgit Langenstein, and Warwick B. Silvester Development in the Datisca—Coriaria nodule type R. Howard Berg Cytoplasmic bridge formation in the nodule apex of actinorhizal root nodules Warwick B. Silvester, Birgit Langenstein, and R. Howard Berg Do mitochondria provide the oxygen diffusion barrier in root nodules of Coriaria and Datisca? John D. Tjepkema, Gangyi Du, and Christa R. Schwintzer Response of respiration and nitrogenase activity in Datisca glomerata (Presl.) Baill. to changes in pO, Janet McCray Batzli and Jeffrey O. Dawson Development of flood-induced lenticels in red alder nodules prior to the restora- tion of nitrogenase activity Melissa A. Dow and Christa R. Schwintzer Seed germination, seedling emergence, and seed bank ecology of sweet fern (Comptonia peregrina (L.) Coult.) Vinton Thompson Spittlebugs associated with actinorhizal host plants Genevieve Louise Mark, John E. Hooker, Alexander Hahn, and Chris T. Wheeler In vitro culture of arbuscular mycorrhizal fungus and Frankia for inoculation of micropropagated Casuarina equisetifolia L. Poo Chow, Gary L. Rolfe, and Dilpreet S. Bajwa Stem chemical compositions of juvenile Elaeagnus and Alnus species October / octobre ARTICLES Ruben L. Boles, Jon Lovett-Doust, and Lesley Lovett-Doust Population genetic structure in green dragon (Arisaema dracon- tium, Araceae) Ewald Weber and Carla M. D’Antonio Phenotypic plasticity in hybridizing Carpobrotus spp. (Aizoaceae) from coastal Califor- nia and its role in plant invasion Inderjit, Chikako Asakawa, and K.M.M. Dakshini Allelopathic potential of Verbesina encelioides root leachate in soil V. Heraut-Bron, C. Robin, C. Varlet-Grancher, D. Afif, and A. Guckert Light quality (red:far-red ratio): does it affect photo- synthetic activity, net CO, assimilation, and morphology of young white clover leaves? J. Kevin Vessey and Bert Luit The nitrate-tolerant symbiosis of Glycine max (L.) Merr. nts382 and Bradyrhizobium japonicum is also tolerant of ammonium D. Marshall Porterfield, Anxiu Kuang, Peter J.S. Smith, Mark L. Crispi, and Mary E. Musgrave Oxygen-depleted zones inside reproductive structures of Brassicaceae: implications for oxygen control of seed development Shannon L. Morrison and Jane Molofsky Environmental and genetic effects on the early survival and growth of the invasive grass Phalaris arundinacea Lorne M. Wolfe and Leslie J. Rissler Reproductive consequences of a gall-inducing fungal pathogen (Exobasidium vaccinii) on Rhododendron calendulaceum (Ericaceae) C-8 Can. J. Bot. Vol. 77, 1999 Philippe Laflamme, Nicole Benhamou, Guy Bussiéres, and Michel Dessureault Differential effect of chitosan on root rot fungal pathogens in forest nurseries Reinhard Berndt =C hrysomyxa rust: morphology and ultrastructure of D-haustoria, uredinia, and telia Abdelfattah Abdellaoui, Asia Larhnim et Ahmed Talouizte Accumulation, absorption et assimilation des nitrates chez dif- férentes variétés de blé tendre marocain : influence de la lumiére Tod D. Ramsfield, Simon F. Shamoun, Zamir K. Punja, and William E. Hintz Variation in the mitochondrial DNA of the potential biological control agent Chondrostereum purpureum J. Rachich and R.J. Reader An experimental study of wetland invasibility by purple loosestrife (Lythrum salicaria) Karsten Zunk, Klaus Mummenhoff, and Herbert Hurka Phylogenetic relationships in tribe Lepidieae (Brassicaceae) based on chloroplast DNA restriction site variation Maria Jesis Martinez, José Maria Barrasa, Ana Gutiérrez, José Carlos del Rio, and Angel T. Martinez Fungal screening for biological removal of extractives from Eucalyptus globulus wood J.M. Kranabetter The effect of refuge trees on a paper birch ectomycorrhiza community Tim Parshall Documenting forest stand invasion: fossil stomata and pollen in forest hollows November / novembre ARTICLES Eric Nicolini et Bernard Chanson La pousse courte, un indicateur du degré de maturation chez le hétre (Fagus sylvatica L.) M.W. Harding, J.C. Stutz, and R.W. Roberson Host-parasite relationships in bean cultivars of varying susceptibility to bean rust W.A. Charlton Studies in the Alismataceae. X. Floral organogenesis in Luronium natans (L.) Raf. W.A. Charlton Studies in the Alismataceae. XI. Development of the inflorescence and flowers of Wiesneria triandra (Dalzell) Micheli Marcia Monreal, S.M. Berch, and Mary Berbee Molecular diversity of ericoid mycorrhizal fungi Sylvie Sabatier, Daniel Barthélémy, Isabelle Ducousso et Eric Germain Allongement et morphologie de pousses annuelles issues de greffe chez le noyer commun, Juglans regia L. cv. Lara (Juglandaceae) Lori A. Gom and Stewart B. Rood Fire induces clonal sprouting of riparian cottonwoods M.A. Fieldes and L.M. Amyot Evaluating the potential of using 5-azacytidine as an epimutagen Florence Fontaine, Hatem Chaar, Francis Colin, Christophe Clément, Monique Burrus, and Jean-Louis Druelle Prefor- mation and neoformation of growth units on 3-year-old seedlings of Quercus petraea Rafael Porras and Jestis Miguel Muiioz Alvarez Breeding system in the cleistogamous species Centaurea melitensis (Aster- aceae) Bret E. Olson and Roseann T. Wallander Carbon allocation in Euphorbia esula and neighbours after defoliation Laura A. Hyatt, Ann S. Evans, and Carol C. Baskin Annual dormancy cycles in Lesquerella fendleri (Brassicaceae) seeds stored under both field and laboratory conditions Nina Sletvold and Geir Hestmark A comparative test of the predictive power of neighbourhood models in natural populations of Lasallia pustulata Daniel F. Brunton and Donald M. Britton /soetes xechtuckerii, hyb. nov., a new triploid quillwort from northeastern North America Thomas. G. Pfleeger, Christopher C. Mundt, and Michelle A. da Luz Effects of wheat leaf rust on interactions between wheat and wild oats planted at various densities and proportions NOTE Sarena M. Selbo and Jeffrey S. Carmichael Reproductive biology of leafy spurge (Euphorbia esula L.): breeding system analysis December / décembre ARTICLES Marie Widén and Bjorn Widén Sex expression in the clonal gynodioecious herb Glechoma hederacea (Lamiaceae) Contents / Sommaire Thomas E. O’Dell, Joseph F. Ammirati, and Edward G. Schreiner Species richness and abundance of ectomycorrhizal basid- iomycete sporocarps on a moisture gradient in the Tsuga heterophylla zone Bjorn Berg, Ryszard Laskowski, and Amalia Virzo De Santo Estimated nitrogen concentrations in humus based on initial nitrogen concentrations in foliar litter: a synthesis. XII. Long-term decomposition in a Scots pine forest Lars Hedenés How important is phylogenetic history in explaining character states in pleurocarpous mosses? Bernhard Denneler, Yves Bergeron, and Yves Bégin An attempt to explain the distribution of the tree species composing the riparian forests of Lake Duparquet, southern boreal region of Quebec, Canada Kadri Poldmaa, Ellen Larsson, and Urmas KOoljalg Phylogenetic relationships in Hypomyces and allied genera, with emphasis on species growing on wood-decaying homobasidiomycetes Jeffrey L. Walck, Carol C. Baskin, and Jerry M. Baskin Seeds of Thalictrum mirabile (Ranunculaceae) require coid stratifica- tion for loss of nondeep simple morphophysiological dormancy Sam Neill and Kevin S. Gould Optical properties of leaves in relation to anthocyanin concentration and distribution Lauchlan H. Fraser and J. Philip Grime Aphid fitness on 13 grass species: a test of plant defence theory Alexandra Riethmiiller, Michael Weif, and Franz Oberwinkler Phylogenetic studies of Saprolegniomycetidae and related groups based on nuclear large subunit ribosomal DNA sequences Zamir K. Punja and Li-Juan Sun Morphological and molecular characterization of Chalara elegans (Thielaviopsis basicola), cause of black root rot on diverse plant species Pedro W. Crous, Ji-Chuan Kang, Conrad L. Schoch, and Godwin R.A. Mchau Phylogenetic relationships of Cylindroclad- ium pseudogracile and Cylindrocladium rumohrae with morphologically similar taxa, based on morphology and DNA sequences of internal transcribed spacers and $-tubulin E.W. van der Heijden, F.W. de Vries, and Th.W. Kuyper Mycorrhizal associations of Salix repens L. communities in succession of dune ecosystems. I. Above-ground and below-ground views of ectomycorrhizal fungi in relation to soil chemistry E.W. van der Heijden and M. Vosatka Mycorrhizal associations of Salix repens L. communities in succession of dune ecosystems. II. Mycorrhizal dynamics and interactions of ectomycorrhizal and arbuscular mycorrhizal fungi Note of Appreciation / Note de reconnaissance Author Index for Volume 77 / Index des auteurs pour le volume 77 Subject Index for Volume 77 / Index des matiéres pour le volume 77 Contents for Volume 77 / Sommaire pour le volume 77