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Leucocoprinus flavescens

[ Basidiomycetes > Agaricales > Agaricaceae > Leucocoprinus . . . ]

Taxonomy in Transition: ...  > Agaricales > Lepiotoid Clade (J&V, 1998)

by Michael Kuo

Leucocoprinus flavescens is a tiny yellow lepiota, similar to Leucocoprinus birnbaumii but with a paler cap that features a brownish center, and substantially smaller spores. The species was originally described by Morgan (1907) from an Ohio collection made under Black Locust and Honey Locust, and has since been recorded from greenhouses in Massachusetts and California. I have made two collections in Illinois that appear to match Leucocoprinus flavescens: one in woods dominated by black locust and one in grass next to my house, under the drip of an air conditioner, with a large honey locust tree 30 feet away.


Ecology: Saprobic; growing alone or scattered in the vicinity of Black Locust or Honey Locust (also reported from greenhouses); summer; distribution uncertain (perhaps to be expected as an outdoor species throughout the range of the apparent tree associates, and as a greenhouse species across North America).

Cap: 2-4 cm; egg-shaped when young, becoming bell-shaped to broadly convex or nearly flat at maturity; dry; grooved from the margin to the central "eye"; powdery or very finely scaly where grooved; smooth in the center; light greenish yellow except for the brownish to tawny brown center.

Gills: Free from the stem; whitish to yellowish; close or nearly distant.

Stem: 3-8 cm long; only a few mm thick; more or less equal above, but with a swollen base; pale yellow; sometimes discoloring reddish brown; when fresh and young covered with tiny powdery scales, but soon smooth (especially after handling); with a yellowish ring on the upper stem that sometimes disappears.

Flesh: Whitish to pale yellow; very thin.

Odor and Taste: Not distinctive.

Chemical Reactions: KOH on cap surface negative.

Spore Print: White.

Microscopic Features: Spores 5-7 x 3.5-5.5 µ; smooth; broadly elliptical to subglobose; dextrinoid; without a pore. Cheilocystidia to about 45 x 15 µ; clavate to fusoid-ventricose or bottle-shaped. Pleurocystidia absent.

REFERENCES: (Morgan, 1907) H. V. Smith, 1981. (Morgan, 1907; Smith & Rea, 1944; Kauffman, 1924; Smith, Smith & Weber, 1979; H. V. Smith, 1981; H. V. Smith & Weber, 1982.) Herb. Kuo 08050201, 08190501.

Lepiota flavescens is a synonym.


Leucocoprinus flavescens

Leucocoprinus flavescens

Leucocoprinus flavescens

Leucocoprinus flavescens

Leucocoprinus flavescens

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Kuo, M. (2007, October). Leucocoprinus flavescens. Retrieved from the MushroomExpert.Com Web site: