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Remarks (internal):Distribution: Known from three localities in Sweden.
Psathyrella merdicola can be recognised by its small spores and a copious veil, microscopically marked by large cells. Psathyrella tenuicula differs by a rudimentary veil and a pubescent cap and stem surface. Psathyrella fimiseda and P. sphaerocystis have slightly larger spores while P. squamosa differs by having paler more pronounced amygdaliform spores, numerous cheilocystidia, and a non-coprophilous habitat.
Description type:Original description 
Description:Cap 5-15(-20) mm broad, at first semiglobose, then expanded convex and finally plane, umbonate or not, when young dark reddish brown (Mu. 2.5YR 2.5/4-2.5/2), becoming strong brown (Mu. 7.5YR 4/6), slightly paler towards margin, hygrophanous, faintly striate on the margin, fading to pale yellow brown; veil with white flocci on entire cap, appendiculate at margin, glabrescent. Gills subdistant, L = 15-24, adnate to adnexed, yellowish red (Mu. 5YR 5/6); edge sometimes minutely white fimbriate. Stem 15-35 x 0.5-2 mm, often bent, very pale brown, pulverulent at apex, flocculose below from veil remnants. Smell not distinctive. Taste mild. Spore print dusky red (Mu. 2.5YR 3/2). Spores 6.5-8 x 3.5-4.5 µm, av. 7.0-7.3 x 3.9-4 µm, Qav. = 1.7-1.8, oblong, narrowly ovoid, in profile sometimes narrowly amygdaliform, rarely subphaseoliform, in water red to yellowish red (Mu. 2.5YR 4/8, 5YR 5/6); germ pore distinct to rather distinct. Basidia 4-spored, 14-22 x 7-8 µm. Pleurocystidia 25-50 x 8-15 µm, conical, lageniform, subutriform, sometimes rostrate or swollen at apex, numerous to rather numerous, faintly yellow below apex. Cheilocystidia of two types: A. similar to shape of pleurocystidia, 20-40 x 6-13 µm, scattered to rather numerous; B. clavate, small, most frequent towards cap margin. Pileipellis most similar to a hymeniderm with clavate, spheropedunculate, ellipsoid to subglobose cells 15-35 µm wide; pileitrama of moderately to strongly pigmented hyphae. Veil cells 20-180 x 6-40 µm, inflated. Clamps present. Habitat: Growing on moderately old cow dung in open pastures or in copses with Quercus robur, Larix decidua, Rosa sp., and Crataegus sp.. 
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