Public Description of Calocybe naucoria (Murrill) Singer

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Name: Calocybe naucoria (Murrill) Singer
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General Description:

CAP 0.5–3 cm across, convex to broadly convex with an incurved margin at first, becoming plane or centrally depressed in age. Surface moist to dry, smooth when young, slightly textured in age. Orange-yellow, yellow to yellow-brown; hygrophanous, at times darker, orange-brown in age when wet, pale when dry. GILLS narrowly attached, with an abrupt, deep notch, close to crowded, narrow. Light yellow, yellow-orange to brownish yellow. STIPE 1.5–4 cm long, 0.1–0.5 cm thick, equal. Surface dry, apex pruinose when young, smooth in age, base often with whitish to yellow fibrils. Yellow to orange-yellow, occasion- ally with reddish tones in age, pruin brighter yellow. FLESH thin, light yellow. Stipe fibrous, solid when young, hollow in age, yellow to brownish yellow. ODOR indistinct. TASTE mild. SPORE DEPOSIT white. MICROSCOPY: Spores 3.5–5 x 2.5–3 μm, ellipsoid, smooth, thin-walled, inamyloid, hyaline. Basidia 15–20 x 4–6 μm, cylindric to narrowly clavate, thin-walled. Pleurocystidia and cheilocystidia absent. Cap cuticle of clavate cells, 8–22 x 5–10 μm, light yellow in KOH. Clamp connections present.
ECOLOGY: Solitary, scattered, or in gregarious patches, fruiting in summer and fall. Saprobic on duff of conifers and Quaking Aspen (Populus tremuloides); typi- cally binding the surrounding duff with hyphae.
SIMILAR SPECIES: Calocybe onychina has a purple cap when young, aging purple brown to orange-brown, and has yellow gills. It fruits in the spring in the moun- tains, soon after snowmelt, (rarely in fall on the coast). Some Gymnopilus species look similar, but are easily distinguished by their rusty orange spores. Similar looking Pholiota species have a viscid cap cuticle and brown spores. The white -spored Callistosporium luteo-olivaceum grows on decaying wood, has more olive-yellow colors, and a distinct red KOH reaction. Xeromphalina species are often much smaller, and have thin, often wiry stipes. Flammulina populicola often grows in clustersfromthebase,orrootsof deadanddyingaspen.Ittypicallyhasatwo-toned yellowish to brownish, viscid to moist cap, and an often dark velvety lower stipe.

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Description author: Excited delirium [EXD]▼ (Request Authorship Credit)