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Pluteus atromarginatus

[ Basidiomycetes > Agaricales > Pluteaceae > Pluteus . . . ]

by Michael Kuo

Like all species of Pluteus, this handsome mushroom is a wood-rotting saprobe with a pink spore print and gills that are free from the stem. Unlike most other Pluteus species, however, it has "marginate" gills: the edges are dark brown or black, while the faces are pale at first and, with maturity, pink. Other distinguishing features include its preference for conifer wood, its relatively smooth (rather than veined) cap center, and microscopic features.


Ecology: Saprobic on decaying conifer wood; growing alone or scattered; summer and fall; widely distributed in North America.

Cap: 3-10 cm; convex becoming broadly convex or flat, sometimes with a broad central bump; dark blackish brown or nearly black; fairly smooth or minutely velvety to scaly (especially over the center); often with pressed-down, streaked fibers.

Gills: Free from the stem; close; whitish at first, becoming pinkish; with dark brown or nearly black edges.

Stem: 4-10 cm long; up to 1.5 cm thick; more or less equal; whitish underneath grayish to brownish fibers.

Flesh: White.

Odor and Taste: Not distinctive.

Spore Print: Pink.

Chemical Reactions: KOH on cap surface negative.

Microscopic Features: Spores 6.5-8 x 4.5-5 µ; broadly elliptical; smooth. Cystidia abundant; variously shaped, from utriform to clavate or fusoid-ventricose; up to 100 x 20 µ; thick-walled; often with horned or encrusted apices. Clamp connections present.

REFERENCES: (Konrad, 1927) Kühner, 1935. (Singer, 1956; Smith, Smith & Weber, 1979; Phillips, 1991/2005; Lincoff, 1992; McNeil, 2006.) Herb. Kuo 08150302.

Pluteus nigrofloccosus is a synonym.

Further Online Information:

Pluteus atromarginatus at MykoWeb
Pluteus atromarginatus at Roger's Mushrooms


Pluteus atromarginatus

Pluteus atromarginatus

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Kuo, M. (2006, November). Pluteus atromarginatus. Retrieved from the MushroomExpert.Com Web site: