Psathyrella spintrigeroides P.D. Orton

 Diagnosis fuente: PERSOONIA - Suplement - Vol. 2 - THE DUTCH, FRENCH AND BRITISH SPECIES OF PSATHYRELLA - 1985 E. KITS VAN WAVEREN - Rijksherbarium, Leiden, The Nederlands
      Cap 20-50 mm, convex or conico-convex, then expanded, sometimes obtusely umbonate, bay or deep date brown, not striate or striate at margin only when moist, hygrophanous, drying out to ochraceous or pale buff, sometimes with slight tawny tinge especially at centre. Veil white, on cap copious, forming appendiculate rather thick dentate scales (sometimes Veil white, on cap copious, forming appendiculate rather thick dentate scales (sometimes striate beneath) at margin and scattered white fibrils or adpressed fibrillose scales on outer part; on stem striate-floccose or fibrillose-scaly remnants, sometimes forming a fugacious ring-zone. Gills + ventricose, subcrowded, adnate, sometimes with tooth, greyish clay or pale clay-brownish, then pale clay-umber or pale purplish brown, finally umber, with white flocculose edge under lens when fresh. Stem 25—60 x (3—)4—7 mm, + cylindrical, sometimes flexuose, hollow, rather firm at first, pure white at first, soon discoloured pale dirty brownish or yellowish brown from base; apex markedly striate from base of gills and white pruinose or pubescent. Flesh of cap concolorous, drying dirty yellowish or whitish in centre, sometimes sepia-horny over gills or in apex of stem; smell faint pleasant, fungussy. Trama of ‘washed’ gill brownish yellow (+ Mu. 10 YR 7/6), towards edge paler. Spore print not recorded.
     Spores 7—8(—9) x 4—4.5 um (mean values 8 x 4.5 pm: 1 collection), in face view ellipsoid or ellipsoid-ovoid, in profile ellipsoid, adaxially flattened or mostly slightly phaseoliform, in water fairly pale yellowish brown with reddish hue (Mu. 5 YR 6/6, 5/6), in NH,OH 10% brown (Mu. 7.5 YR 5/4), in KOH 5% sordid brown (Mu. 10 YR 5/3), not opaque, with distinct germ pore (1—1.5 ym) and small hilar appendix. Basidia 20-35 x 7-8 um (acc. to Orton), 4-spored. Pleurocystidia 60—77.5 x 7.5-12.5 um, abundant, narrowly fusiform, lanceolate with relatively broad pedicel and acute to subacute apex, with thickened wall, 0.5—1.8(—2) pm, often thickest at apex, sometimes colourless but mostly distinctly pale brown in NH,OH 10% with often inside apex many to numerous minute granules embedded in a minutely granular substance, also often a few granules on external surface of apex, but crystals or crystalline material absent. Marginal cells: pleurocystidioid cheilocystidia 45—60(—65) x 10-15 um, abundant, densely packed, smaller and often thicker than pleurocystidia, a few cylindrical or subutriform and thin-walled, intermixed with scattered thin-walled spheropedunculate and clavate cells, 15—30 x 7.5—12.5 um, and numerous immature basidia. Hymenophoral trama in NH,OH 10% sub micr. distinctly yellowish brown from membranal pigment; yellow hyphal septa or encrustations. Pileipellis cellular; cells20—40 um diam. (acc. to Orton)
HABITAT & DISTRIBUTION, — On twigs and logs and among leaves of Fagus.