1-3cm across when expanded, 0.5-1.5cm high when young, oval or cylindric to conic when young, broadly convex or flat when old; buff to yellow brown, usually with darker (cinnamon brown or fulvous) center, when old becoming grayish except for center; "deeply grooved (pleated) nearly to center", margin sometimes recurved [upturned] when old
very thin, fragile
free but attached to a collar around top of stem, well-spaced, narrow; "soon gray and eventually black, but tending to wither rather than liquefy"
3-7.5cm x 0.1-0.3cm, thin, hollow, more or less equal, very fragile; white or buff; smooth
spores 10-13 x 6.5-10 microns, broadly elliptic, smooth, (Arora), spores 9.6-13.3 x 5.9-8.4 x 8.5-10.3 microns, miter-shaped to lentiform [lens-shaped] in front view, elliptic in side view, smooth, dark red-brown, with eccentric germ pore; basidia 4-spored, 25-40 x 11-16 microns, clavate, without basal clamp; pleurocystidia 70-125 x 20-35 microns, cylindric to ventricose, cheilocystidia 35-60 x 16-25 microns, lageniform to clavate or vesicular; cap cuticle of vesicular cells 25-40 x 14-25 microns, some septa with clamps, (Breitenbach), spores 9.5-13 x 6-8 x 8.5-10.5 microns, lentil-shaped, (Trudell)
Synonyms and Alternate Names:
Coprinus plicatilis (Curtis) Fr.