Psathyrella storea (Fr.) M.M. Moser

 Diagnosis fuente: PERSOONIA - Suplement - Vol. 2 - THE DUTCH, FRENCH AND BRITISH SPECIES OF PSATHYRELLA - 1985 E. KITS VAN WAVEREN - Rijksherbarium, Leiden, The Nederlands
     Cap 16-40 mm, at first obtuse-conical, then truncate-conical but rapidly spreading and plane with obtuse, voluminous rounded umbo (in very early stages rarely only just present), with margin sometimes slightly wavy, thick and fleshy, not hygrophanous except for cream coloured yellowish-greyish umbo, contrasting with brown-grey but not dark, dull rest of cap under an abundant, very adpressed cover of very delicate, small, white fibrils causing a satiny, radially combed aspect, moreover and especially near margin surface covered with white, sometimes later totally disappearing, fibrillose specks, with bare, glossy umbo with metallic appearance from satiny surface, on artificial rehydration becoming dark, sordid chestnut brown, more ochre at umbo, substriate at margin. Veil white, in very young specimens appendiculate, sometimes leaving for a short while a vague fibrillose zone on stem, soon disappearing. Gills 3.5—-4 mm broad, not very crowded, with lamellulae of 2—3 lengths, narrowly adnate, narrowing near stem, ventricose, at first white, then pale brown with pinkish hue, with somewhat paler edge. Stem 30-75 x 2.5—6 mm, fleshy, firm, fasciculate, attached to neighbouring stems by mycelial down, not strigose, subcylindrical, sometimes slightly flexuose, narrowly fistulose, pure white, becoming a little sordid, pruinoseflocculose at apex, lower down slightly fibrillose due to white (or slightly brown due to spores) fibrils (but see observations). Flesh of cap ochreous under umbo, elsewhere brownish grey, of stem white but in base pale brown-yellow. Smell none. Trama of ‘washed’ gill very pale brown (Mu. 10 YR 7/3) from base to edge. Spore print not recorded.
     Spores 9-11 x 5.5—6.5 um (mean values 10.0 x 5.7 um: 1 collection), ellipsoid, adaxially flattened, in water strong brown (Mu. 5 YR 4/8;7.5 YR 5/6), in NH,OH 10% and KOH 5% sordid brown (Mu. 7.5 YR 5/4), with very distinct large germ pore (2—2.5 um) and distinct hilar appendix. Basidia 18-38 x 9-12 um (acc. to Romagnesi). Pleurocystida 35-50 x12.5—22.5 um, versiform, chiefly utriform but also subellipsoid, sublageniform, with short and broad pedicel, very scarce, thin-walled, colourless. Marginal cells: pleurocystidioid cheilocystidia 35—50 x 12.5—22.5 um, abundant and densely packed, intermixed with fairly numerous medium-sized spheropedunculate cells (acc. to Romagnesi: 38-50 x 11—22 ym); all cells thin-walled, colourless. Hymenophoral trama in NH,OH 10% sub micr. very pale brown without yellow hyphal septa or encrustations. Pileipellis a layer of subglobose cells under a superficial layer of cylindrical, thin, crowded hyphae not or scarcely narrowing at the septa (acc. to Romagnesi).
HABITAT & DISTRIBUTION. — Caespitose on stump of Salix species, growing together With  Coprinus atramentarius.