New Dactylosporina (Physalacriaceae, Agaricales) from Japan

DACTYLOSPORINA (Clémençon) Dörfelt

1985. Feddes Repert. 96 : 236
= Oudemansiella subg. Dactylosporina Clémençon. 1979. Sydowia 32 : 77.
= Oudemansiella sect. Dactylosporina (Clémençon) Pegler & T.W.K. Young. 1987. Trans. Brit. Mycol. Soc. 87 : 598.

Type species: Tricholoma steffenii Rick. [ = Dactylosporina steffenii (Rick.) Dörfelt ] = Oudemansiella subg. Pseudomycenella Clémençon. 1979. Sydowia 32 : 76.

Type species : Mycenella (as Oudemansiella) kuehnerii Romagn.

Basidiomata collybioid, diminutive to sturdy, rooting. Pileipellis generally composed of a single element (pileocystidia; see under D. kuehneri for deviation), viscid. Pleuro- and cheilocystidia as in hymenopellis. Caulocystidia present, usually repent. Basidiospores globose to subglobose, coarsely warted  / spiny. Pseudorhiza present. Annulus lacking. Mostly South and Central America (one species in Europe).

Key to species of Dactylosporina

1. Mid-stipe caulocystidia absent; spores 9-12 µm diam (excl. spines) ...........2

1*. Mid-stipe caulocystidia well-developed ............................3

2. Pileus usually less than 25 mm broad; apical caulocystidia cylindrical, in pyramidal fascicles; pileocystidia clavate, 30-60 x 9-13 µm (small and narrow); pleurocystidia common, jar-shaped, 100-150 x 33-51 µm; caulocystidia limited to stipe apex and base; Ecuador, Guyana, Colombia ....................... 2. D. glutinosa

2*. Pileus -45 mm broad; apical caulocystidia capitulate, in parallel fascicles; pileocystidia clavate over disc, sphaeropedunculate outward; pleurocystidia rare, utriform to broadly clavate, 70-105 x 26-29 µm; Guyana . . . . . . . . . . . . . . . . . . . . .1. D. cephalocystidiata

3. North-western Europe; basidiomata diminutive (pileus -12 mm broad, stipe-12  mm long), solitary, dark brown; stipe downy with hyaline hairs; spores 10.5-14 x 12-13.5 µm (excl. spines); spore ornamentation -3 µm long .................3. D. kuehneri

3*. South America; basidiomata mid-to large-sized; caulocystidia well-developed, but stipe not downy ...................... 4

4. Pileus 15-85 mm diam, brown to umbrinous, subviscid; stipe 65-170 x 2-20 mm; spores 11-14(-18) x 10-12(-17) µm (excl. spines); basidia 4-spored; pleurocystidia ventricose with beaked capitulum, 160-171 x 40-45 µm; [marginate and 2-spored forms occasional] Argentina, Bolivia, Brazil, Colombia, Venezuela, Costa Rica, French  Guiana .................... 5. D. steffenii

4*. Pileus 6-45 mm diam, deep brown, dry to subviscid; stipe slender, 60-120 x 1-3 mm; spores14-15 x 13.5-14 µm (excl. spines); basidia 2-3-4-spored; pleurocystidia jar-shaped,75-150x20-40Ilm; [2

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 Mycoscience

Volume 56, Issue 1, January 2015, Pages 10-13

A new species of Dactylosporina (Physalacriaceae, Agaricales) from Japan

Shuji Ushijima^a Eiji Nagasawa^b Shiro Kigawa^c Nitaro Maekawa^a

^a Fungus/Mushroom Resource and Research Center, Faculty of Agriculture, Tottori University, Koyama 4-101, Tottori 680-8553, Japan

^b The Tottori Mycological Institute, Kokoge 211, Tottori 689-1125, Japan

^c Magarimatsu 1-11-13, Hadano, Kanagawa 259-1321, Japan

Dactylosporina brunneomarginata sp. nov., belonging to the family Physalacriaceae (Agaricales) is described and illustrated. This fungus differs from previously described species of Dactylosporina microscopically by its viscid pileus and stipe surface when wet, the lamellae with dark brown edges, and microscopically by its gloeocystidioid pileo-, cheilo-, and caulocystidia with olive to yellow-brown oily content. This is the first report on Dactylosporina from Asia.

Keywords

Agaricomycetidae, Echinulate basidiospores Taxonomy