Dicranoloma steenisii (Musci: Dicranaceae), a new species from Papua New Guinea

5 Pages·1996·1.6 MB·English

by  Klazenga, Niels

BLUMEA 41 (1996) 11-15
Dicranolomasteenisii (Musci: Dicranaceae),
a new species from Papua New Guinea
Niels Klazenga
Summary
Dicranoloma steenisii,anewspeciesfromPapuaNew Guineais describedhere.Diagnostic features
include longfiliform leaves,astrongcostaand absence ofalimbidium andacentral strand. Itseems
mostclosely related toD.armitii,fromwhichitcanbeseparatedby thegraduallyattenuate, notcon-
tracted,leaves.
Introduction
Thetropical-temperate, mainly southern hemisphere, genusDicranolomawasestab-
lishedby FerdinandRenauld(1901). Brotherus(1924) listed76species worldwide.
IntheIndexMuscorum2and5 (Van derWijk etal., 1962, 1969) 121 validspecies
are listed, 37ofwhichoccurinMalesia, thisregion thusbeing therichest inspecies.
Recentfloristic-taxonomictreatments(Tan &Koponen, 1983; Eddy, 1988; Tan,
1989; Norris& Koponen, 1990;Akiyama, 1990)have ledto avastreductionofthe
numberofMalesianspecies. However,these treatments are partly contradictory in
theirsynonymyandmost cover apartofMalesiaonly. Currentrevisionary work on
theMalesianDicranolomaspecies has ledto the discovery ofanewspecies.
Norris andKoponen (1989, 1990) are not followedhereintransferring all Male-
sianDicranolomastoDicranumHedw. andlimitingDicranolomatoasmallgroupof
North AustralianandNew Caledonianspecies. Inmy opinion moreresearch is need-
ed beforea decision onthe statusofDicranolomais made.Margadant andGeissler
(1995) pointed out thatDicranolomaisantedatedby Megalostylium Dozy & Molk.
At thesame timethey proposed to conserve the nameDicranoloma.Awaiting the
decisionoftheNomenclatureCommitteefor Bryophytes, Dicranolomais takenhere
in thesenseofRenauld(1901).
Dicranoloma steenisiiKlazenga, spec. nov.
Species nova D. armitii affinis,aquadiffertfoliis leniter attenuatis etsetis longioribus.
Typus: IserentantB-48A (H holo;NY iso),Papua New Guinea: Eastern Highlands Prov.,
Watabungterr.,between Goroka and Kundiawa,2620 m alt., 1 Dec. 1989. Paratypes:
Eddy 1172 (BM),PapuaNew Guinea: MadangProv.,Finisterre Range,Lake Nahoregion,
2500m, 16Nov. 1964;Hoffmann 89-352 (CBG, NY),Eastern HighlandsProv.,Doulo
Pass (25 km W ofGoroka), N ofHighlands Highway,2550 m, 30 Nov. 1989;Norris
64304 p.p. (H, among paratypeofD. cutlackii)', Morobe Prov., 5 km SE ofLake Wamba
(5km S ofTep-TepAirstrip, onsaddle ofridgeleadingtotopofMtFinisterre,3000 m, 24
July 1981;Robbins 2813 (L), Western HighlandsProv.,Wabagarea,Sugarloafarea S of
Wapenamanda,3000 m, 29 June 1960;Streimann 20602 (CBG, H), Western Highlands
Prov.,NebilyerRiver, 28km WNWofMtHagen,2760 m, 23June 1982.
12 BLUMEA —Vol. 41, No. 1, 1996
Dicranoloma steenisii Klazenga.a. Habit; b. idem,with sporogones (a: Hoffmann89-352,CBG;
b: Eddy1172,BM).Scalebars = 1mm.
N. Klazenga: Dicranoloma steenisii, spec. Nov. 13
Dicranoloma steenisii Klazenga. a. Alarcells; b. basal lamina cells;
c.basallamina cells atleafmargin;d.upperlamina cells;e.cross sec-
tion throughthe costa, just above the alar patches(a—e:Iserentant
B-48A,H). Scalebar = 100µm.
Malesnot found.—Femaleplants growing inup to 13cm high turfs, greento yel-
lowishbrown. Stemsubflorally branched, densely tomentose and loosely foliose;
diameter0.25-0.35mm, centralstrandabsent, corticalcellsthick-walled, thelumina
getting smallerandthe walls thickerand darkertowards theepidermis. —Leaves
(6-)ll-16 by 0.5-0.8 mm,ovate-lanceolateto linear, gradually attenuate;above
theamplexicaulous, decurrentbase witha distinct bend,spreading orfalcate-secund
throughout thestem, basalhalfcanaliculatetosubtubulous,upper halfalmostentire-
ly formed by thecosta, cross section V-shaped, often fugaceous. — Alarpatches
distinct, 0.4-0.5by 0.35-0.4mm, triangular,reaching hecosta or separated fromit
by brown-walledjuxtacostal cells.Margin serrate intheupper2/3-7/8,entirebelow.
14 BLUMEA Vol. 41, No. 1, 1996
Limbidiumabsent. Costa 100-160urn wide,40-60 um thick, well-markedin its
entire length, percurrrent, abaxially bearing scattered teeth inthedistal half; guide
cells7-11 in 1layer,oftenseparated from thelaminaon oneorboth sides by stereids;
stereidsforming adaxial andabaxialbandsconsistingof 1 or2(or 3) layers; adaxial
andabaxialepidermal cellspossessing a distinctlumen.—Alarcells 15-80by 15-
40um, quadrate torectangular, hyaline, not inflated;wallsincrassate, thelateralwalls
4-12urnthick, muchthicker thantheendwalls, occasionally porose, oftenwith an-
gular thickenings. Basallaminacells(20-)40-120 by 6-16um, elongate to shortly
linear; wallsincrassate, porose, walllumenratio 1: 1-2. Decurrency cellsandjuxta-
costal cells similartothelaminacellsbut withbrown walls.Laminacellsgradually
becoming shorterandnarrower andlessporosetowardstheapex. Upperlaminacells
20-90 by 6-10urn, oblong to shortly linear;wallsincrassate, poroseor not porose,
wall lumen ratio 1:1-2.Extreme distalcells 20-30pm long, oblong, notporose.
Teeth atleafmargin small, consistingof 1 cell, thelumenofwhichis not larger than
those ofadjacent marginal cells.— Perichaetiaterminal, laterally displaced. Peri-
chaetialleaves 7-11 by 0.8-1 mm,above the 1.5-5mmlong, ovate tobroadly ovate
base abruptly contracting intoa long subula which almostentirely consists ofthe
costa. Archegonia 1.1-1.5mm long. — Sporogones 1 or2perperichaetium. Vagi-
nuladarkbrown, 1.7-2mm long, with some archegonia atthe extremebase, else-
where smooth. Seta yellowish to reddish brown, 4.5-5 mm long, smooth; 0.16-
0.18mm indiameter,central strandpresent, cortical cellsratherthick-walled, walls
1-4um thick, epidermal cells with 10-18umthick outer walls. Capsule reddish
brown, 1.5-2mmlong, cylindrical, erect, smooth. Thecawallconsisting of1 thick-
walledexothecial and3or 4thin-walledamphithecial layers. Exothecialcells30-75
by (10-)15-40um, irregularly isodiametricto rectangular, not inorderly longitudi-
nal rows. Stomatapresentatapophysis andtheextremebasalpartofthetheca,phan-
eropore. Annuluspersistent, consistingof2rows ofcells. Peristometeeth upto0.6
mmlong,50-70um wideatbase, asymmetrically bifidintheupper3/4-7/8, some-
times fenestratebelow almostto thebase; dorsal face vertically striatein thebasal
2/3, papillose above;ventral facesmooth
inthebasalc. 112,papillose above;upper
trabeculaepapillose. Operculum c.2 mm
long, conical, obliquely rostrate. — Ca-
lyptra not found.— Spores 20-28 nm,
spherical, finely papillose.
Etymology—Namedtocommemorate
the opening oftheVan SteenisBuilding
by Her Majesty Queen Beatrixon June
11, 1996.
Distribution Thespecies isendemic
—
to the highlands ofPapua NewGuinea.
Only the typespecimens are known so
far.
Habitat—Growingonsoilandontree
trunks in montane and mossy forest, at
2500-3000m above sealevel. Distribution ofDicranoloma sleenisii Klazenga.
N. Klazenga: Dicranoloma steenisii, nov. spec. 15
Notes— Collectionsbelonging toD.steenisiihavebeen foundinherbariaunder
D.brevisetum andD.blumei.Fromboth species itcanbe distinguished with ahand-
lensby thestrongcosta whichalmostentirely fillstheupperhalfofthe leaf. More-
over,itcan be distinguished easily frombothspecies by the absenceofalimbidium.
InadditionD. steenisiican be distinguished fromD. blumeiwithahand-lensby the
densetomentum ofthe stem inwhich thealarpatches are hidden,and microscopi-
cally by theabsenceofacentral strand.
Dicranolomasteenisiiseems closely relatedtoD.armitiias appearsfromtheanat-
omyofthecostaandthe lack ofa centralstrand. Confusion,however,is not likely
because D.steenisiilacks the contractionofthe leafabovethe alarpatches, which
is typical ofD. armitii.Moreover, D.steenisiihas longer upperlaminacells anda
longerseta thanD. armitii.
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