Psathyrella trepida (Fr.) Gille

Diagnosis fuente: PERSOONIA - Suplement - Vol. 2 - THE DUTCH, FRENCH AND BRITISH SPECIES OF PSATHYRELLA - 1985 E. KITS VAN WAVEREN - Rijksherbarium, Leiden, The Nederlands
     Cap 12-30 mm, campanulate, obtuse, spreading to convex, date brown, fuliginous brown, fuscous, at sometimes slightly umbonate centre yellowish brown (on Fries’ plate already drying?), strongly striate up to 3/4 from margin, membranaceous; hygrophanous (pink, rugulosity or micaceous not mentioned). Veil not mentioned by Fries, but according to Gulden & Lange (1971: 16) remnants of veil present. Gills 2-3 mm broad, slightly ventricose, ascending, broadly adnate, crowed, thin, fuliginous black (but on Fries’ plate dark greyish brown (Mu. 10 YR 4/2) in basal half, pale brown (Mu. 10 YR 7/3) towards edge). Stem 45-80 x 1-2 mm, straight, rarely slightly flexuose, cylindrical, at extreme base slightly clavate (2-2.5 mm), rooting (pseudorrhiza very short), pellucid, smooth, hollow, whitish to isabelline. Trama of ‘washed’ gill under binocular lens distinctly but not strongly brownish (Mu. 10 YR 7/3, 6/3) from base to edge. Spore print black.
     Spores 10-11.5 x 5.5—6.5 ym (mean values 10.8 x 6 ym ; 1 collection), ellipsoid but adaxially flattened, in water red (Mu. 2.5 YR 3/6) in NH,OH 10% dark brown (Mu. 5 YR4/3) in KOH 5% sordid brown (Mu. 10 YR 3/3), opaque, with distinct germ pore (+ 2 um) and small hilar appendix. Basidia 4-spored (in exsiccatum unsuitable for measurements). Pleurocystidia 35-50 x 10-16 um, ventricose-sublageniform, thin-walled, colourless. Marginal cells not studied (exsiccatum unsuitable). Hymenophoral trama pale yellowish from base to edge, no hyphal septa or encrustations seen. Pileipellis made up of roundish cells16-24 um diam.
HABITAT & DISTRIBUTION. — Solitary in marshes and in boggy and muddy areas, in moss.