Taxonomic Notes on the Lichen Family Verrucariaceae in Japan (Ill). Agonimia tristicula New to Japan

4 Pages·1993·0.34 MB·English

by  Hiroshi Harada

植物研究雑誌
J. Jpn. Bot.
68: 166ー169(1993)
Taxonomic Notes on the Lichen Family Verrucariaceae in Japan (111).
Agonimia tristicula New to Japan
Hiroshi HARADA
Natural History Museum and Institute Chiba，
955-2 Aoba-cho，Ch uo-ku，Ch iba 260，JA PAN
日本産アナイボゴケ科地衣類分類ノート (ill).
Agonimia tristicu l，a 日本に産す
原田浩
千葉県立中央博物館 260千葉市中央区青葉町955-2
(Received on December 17，1 992)
Agonimia tristicula (Nyl.) Zahlbr. (Lichenes，V errucariaceae) is reported for the first time for
Japan. A description and are given in this paper on the basis of as pecimen collected in Hachi-
figure~
jo 1sl. of 1zu 1sls.
On ac ollecting trip to Hachijo Isl. of Izu Isls. (Nyl.) Zahlbr. and A. octosporαCoppins et James.
In February 1992，I f ound al ichen thallus com- The specimen from Hachijo Is1. can be identified
posed of very small squamules with almost com- with A. tristicula，s ince it has 1-spored asci and
pletely exposed black perithecia growing over perithecia with ar ough surface. The identification
mosses on the trunk of Alnus sieboldiana. It was also confirmed by comparing with the
belongs to Agonimia in the family Verrucariaceae holotype of A. tristicula. This species is previously
because it has the following diagnostic characters known from Europe，t he Azores Isls.，N orth
of the genus (Coppins and James 1978): (1) thallus America，a nd the Philippines (Coppins and James
composed of small squamules paraplectenchy- 1978，E gan 1987，A ptroot and Sipman 1989). The
matous throughout (2) with minute papillae，( 3) range is now extended to Japan. The following
exposed dark-colored perithecia with (4) periphyses description and figures are based on the specimen
as only hamathecial element，( 5) three-layered collected in Hachijo Is ，.1Japan.
perithecial wall composed of an outer paraplecten-
chymatous zone with dark brown inclusions，a n Agonimia tristicula (Ny1.) Zahlbr.，O esterr. Bot.
inner hyaline paraplectenchymatous zone and an Zeitschr. 59: 351 (1909).
intermediate zone，a nd (6) muriform spores. Only Verrucaria tristicula Ny ，.1Flora 48: 356 (1865).
two species are known for the genus: A. tristicula Type: Europe，s upra muscos in Aberdeenshire
一一166一一
June 1993 Joumal of Japanese Botany Vol. 68 No. 3 167
(H-NYL 2295 -holotype). muriform，u niversally thin-walled，o val to almost
External Morphology: Thallus squamulose; fusiform，or bacilliform，1 35-180 x3 0-40μm.
squ田nuleslobate and attached to the substratum Remarks: The specimen from Hachijo 1s1. in
only with the basal end，s cattered or slightly Jap an differs from the European material in some
aggregated; lobes irregularly or pinnately branched minor morphological characters as follows. (1) The
af ew times，o r dissected，c a. 0.1 mmw ide，d is- Japanese specimen produces obviously larger
crete; upper surface greenish gray (fresh material) spores (135-180 x3 0-40μm) than those found in
with or without pale to dark brown tinge，d ull， specimens collected in Europe and the Azores
smooth，s omewhat convex; lower surface whitish， “((60-)80-120(ー150)x 30-50μm" (Coppins and
rough and granulose (soredia-like)，e xposing James 1978). The difference does not seem to be
whitish medulla，l acking rhizines. Perithecia significant to separate species. 1t should be noted
common，s cattered，a lmost completely exposed， here that the Japanese specimen produces con-
black and more or less glossy，o void，o r obpyri- stantly one spore in an ascus，w hereas either one
form，c onstricted at the base，0 .2-0.5 mm or two spores are produced in an ascus in speci-
highxO.15-0.3 mm wide， with (4-)5-6 mens from Europe and the Azores. When spores
latitudinal ridges (prominent in the upper part， are produced in reduced number in an ascus as in
disappearing in the lower part). Pycnidia not the genus Pertusaria (Oshio 1968)，t he spore size
found. tends to be almost in inverse ratio to the number
Anatomy: Thallus 50-100μm thick，a lmost in each ascus. (2) Periphyses of the Japanese
homoiomerous，c overed with apparent cortical specimen tend to be shorter than those in European
layer on the upper surface，e uparaplectenchy- material. Those in the upper part of the peri-
matous，f requently with intercellular spaces; thecium are 20-25μm long in the former，bu t are
lumina of hyphae almost isodiametric，3 -5μm in 30-50μm long in the latter. (3) The
diameter; cortical cells with several prominent subhymenium is lenticular in the Japanese speci-
papi1lae or almost lacking; phycobiont cells grass- men，w hereas in the European material it is fre-
green，s cattered. Perithecia obpyriform，2 80-450 quently concave to almost flat on upper side as
μmh igh >< 220-250μm wide; exciple rough on the usuallY found in the Verrucariaceae.
surface，ca . 50μm thick，c omposed of three layers， Specimen examined: Japan，1 zu 1sls.，H achijo
the inner layer hyaline，t he middle layer mottled 1s ，.1Miharayama (1.2 km East of the summit)，5 60
with very dark brown to almost black grains，t he m al ，.t on mosses on trunk of hardwood，A lnus
outer layer very dark brown to almost black; sieboldiana，1 7 Feb. 1992，H . Harada 12290
periphyses almost simple，2 0-25μm long and ex- (Natural History Museum and 1nstitute，Ch iba).
tending more or less towards the ostiole in the Additional specimens examined: U. K. East
upper parts of the perithecium，ca . 10μm long and Sussex，C oppins s.n. (E); Scotland，C oppins &
extending centripetally to the median of the peri- Tibell，in herb. Coppins 2315 (E); Brecon，Co ppins
thecium in the middle and lower parts of the 10965 (E); 1sland of Wight，Co ppins s.n. (E).
perithecium; subhymenium biconvex，2 5-30μm
thick at the center; hymenial algae absent; asci 1w ish to express my sincere thanks to curators
clavate，bi tunicate，1 30-200 x3 5-50μm; spores 1 of the herbaria of Royal Botanic Garden，E din-
in each ascus，hy aline to very pale brown，st rongly burgh (E) and Helsinki University (H)，fo r aπang-
168 植物研究雑誌第68巻第3号 平成5年6月
Fig. 1. Agonimia tristicula from Japan. A，h abit (arrow head indicating ap erithecium); B，cr oss section
of thalIus; C，sp ores; D，ve rtical section of ap erithecium; E，th e same as D. (A-E，H arada 12290. A，
air-dried material; B-D，G AW preparations; E，L PCB preparation)
June 1993 Journal of Japanese Botany Vol. 68 No. 3 169
ing loan specimens. Deep thanks are extended to 要 旨
Dr. S. Kurokawa in Toyama and Dr. H. Kashi-
1992年2月，八丈島三原山山頂近くの稜線に
wadani of National Science Museum，T okyo for
立つオオパヤシャブシの樹幹上の蘇苔類のマット
critically reading the manuscript，a nd to Prof. T.
上に， これまで日本からは知られていなかったア
L. Esslinger of North Dakota State University for ナイボゴケ科の鱗片状地衣を採集した. これは以
correcting the English text. 下に挙げる特徴を示すことから Agonimiα属に属
するものであった: (1)被子器は黒く，地衣体
References
から裸出する， (2) hamatheciumとして周糸のみ
Aptroot A. and Sipman，H. 1989. New lichen records from
the Philippines. Acta Bryolichenol. Asiat. 1(1，2): 31-41. を持つ， (3) perithecial wallsは異型菌糸組織で，
Coppins B. J. and James P. W. 1978. New or interesting 透明な内側と，暗褐色の外側と，中間層からな
British lichens 11. Lichenologist 10: 179-207.
る;(4)胞子は石垣状多室;(5)地衣体は極めて
Egan R. S. 1987. A fifth checklist of the lichen-forming，
lichenicolous and allied fungi of the continental United 小さな鱗片状で，異型菌糸組織からなり， (6)表
States and Canada. Bryologist 90: 77-173.
面にパピラを生ずる. これまで本属として知られ
Oshio M. 1968. Taxonomical studies on the family Per-
tusariaceae of Japan. J. Sci. Hiroshima Univ.，s er. B， る2種のうち，胞子を l子嚢中に 1個しか生じな
div. 2( Botよ12(1):81-163. い点でA. tristicula (Ny1.) Zahlbr. と似ており，
胞子を 8個生ずる A. ocω再poraCoppins et Ja mes
とは明らかに異なる.更にA. tristiculaのタイプ
標本等と比較検討した結果，同種と判明した.た
だし，八丈島産の標本は，欧州産のものと比べる
と，胞子が大きい，周糸が短い，子嚢下層がレン
ズ形になる傾向が強いなど，若干の差がみられる.