Psathyrella phaseolispora Arnolds

http://PERSOONIA - Suplement - Vol. 2 - THE DUTCH, FRENCH AND BRITISH SPECIES OF PSATHYRELLA - 1985 E. KITS VAN WAVEREN - Rijksherbarium, Leiden, The Nederlands
Cap 18 mm, obtusely conico-convex, sordid ochre brown, towards margin brown, with
violaceous flush, striate up to half way from margin, hygrophanous, drying out to cream-coloured
with ochre centre, micaceous, without pink. Veil not seen. Gills ventricose, fairly
narrowly adnate, rather crowded, violaceous brown, with white edge. Stem 28 x 2-5 mm,
cylindrical, white, with smooth surface. Trama of ‘washed’ gill pale brown (Mu. 10 YR 6/4),
paler towards edge. Spore print not recorded.
Spores 8—10 x 5—6 um (mean values 9 x 5.5 um: 1 collection) in face view ellipsoid or often
distinctly ovoid, in profile conspicuously phaseoliform, in water orange-brown (Mu. 5 YR
5/6, 5/8), in NH,OH 10% and KOH 5% warm brown (Mu. 5 YR 4/6), not opaque, with
fairly distinct germ pore (+ 1.5 ym) and very small hilar appendix. Basidia 6—-7.5 wm broad
(according to Arnolds). Pleurocystidia 30-50 x 10-12.5 (—20) pm, scarce, utriform, thinwalled,
colourless. Marginal cells: spheropedunculate and clavate cells 17.5-35 x 10-22.5
pm, abundant and dominating picture of cellular lining of sterile gill edge, intermixed with
scarce and scattered utriform pleurocystidioid cheilocystidia, 27-35 x 7.5-10(—12) um,
sometimes in groups of 2—4 cells; all cells colourless and thin-walled. Pigmentation of
hymenophoral trama in NH,OH 10% sub micr. pale yellowish brown from membranal
pigment, without yellow hyphal septa or encrustations. Pileipellis cellular, cells 10-32 pm
diam., colourless.
HABITAT & DISTRIBUTION. — In manured grassland (Poa-Lolietum). Known only from