An eastern North American inky cap that grows in large clusters on well-decayed hardwood logs and stumps. Young caps are covered in a whitish to yellowish veil that breaks into large felty patches over a brownish-yellow surface, and the gills blacken and liquefy. The stem ends in a rimmed bulb set into the wood.
Edibility disputed; not recommended. Gastric upset has been reported, and it is suspected to contain coprine, which can cause illness if alcohol is consumed around the time the mushroom is eaten. Coprinopsis atramentaria is similar and contains coprine.
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Saprobic in clusters on well-decayed hardwood logs and stumps, sometimes on buried wood or litter. Summer and fall, especially June to July.
Distribution
Eastern North America, east of the Great Plains and Rocky Mountains.
Characteristics
Cap: 3-8 cm, oval when young, expanding with a grooved, upturned, splitting margin; surface smooth and brownish yellow beneath whitish to yellowish felty veil patches; grayish with age. Gills: narrowly attached or free, crowded, white becoming gray then black and liquefying. Stem: 5-13 cm long, up to 1 cm thick, tapering slightly upward, with a rimmed basal bulb. Flesh: thin, white, unchanging. Odor: not distinctive. Spore print: black. Spores: 6-10 x 4-5.5 µm, ellipsoid, smooth, with a pore. Microscopic: thin-walled and thick-walled (metuloid) pleurocystidia.