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Entoloma serrulatum

[Basidiomycota > Agaricales > Entolomataceae > Entoloma . . . ]

by Michael Kuo

Until you turn it over, this tiny mushroom looks like any number of blackish, bluish gray or purplish gray entolomatoid mushrooms. But a look at the black-edged gills instantly distinguishes Entoloma serrulatum from most of the others. The term in Mycologese for gills that have edges colored differently from the faces is "marginate," and perhaps there is no more striking example than this mushroom. Entoloma serrulatum was originally named from Europe, where it is widespread and common, and grows in grassy areas. Our North American version, which may be a separate species (or group of species), is found in woodland areas.

Description:

Ecology: Saprobic; growing alone, scattered, or gregariously in woods, often in damp areas; occasionally fruiting from moss-covered wood; late summer and fall (or over winter on the West Coast); apparently widely distributed in North America. The illustrated and described collection is from a tanoak forest in California.

Cap: 1-3 cm; convex, becoming broadly convex or slightly depressed; radially fibrillose-silky or finely scaly, especially over the center; black to bluish black, fading to gray; the margin finely lined in age.

Gills: Attached to the stem; close; whitish or pale bluish gray at first, becoming pinkish; with black or bluish black edges; jagged; with frequent short-gills.

Stem: 2-4 cm long; 2-3 mm thick; equal; silky at the apex and bald below; hollow; colored like the cap; with white mycelium at the base.

Flesh: Thin; fragile; pale or grayish.

Odor and Taste: Mealy.

Spore Print: Pink.

Microscopic Features: Spores 9-13 x 6.5-8 µ; 5- or 6-sided. Pleurocystidia absent. Cheilocystidia 40-65 x 10-13 µ; cylindric with subclavate, clavate, or subcapitate apices. Lamellar edge sterile. Pileipellis a cutis with areas of uplifted or ascending, clavate terminal elements; dark brown to blackish in 10% ammonia; pigment intracellular. Clamp connections absent.

REFERENCES: (Persoon) Hesler, 1967. (Fries, 1818; Saccardo, 1887; Kauffman, 1918; Hesler, 1967; Smith, Smith & Weber, 1979; Noordeloos, 1988; Lincoff, 1992; Largent, 1994; Breitenbach & Kränzlin, 1995; Roody, 2003; McNeil, 2006; Miller & Miller, 2006.) Herb. Kuo 01150506.

Synonyms include Leptonia serrulata, Eccilia atrides, and Rhodopyllus serrulatus.

Further Online Information:

Entoloma serrulatum at Roger's Mushrooms

 

Entoloma serrulatum

Entoloma serrulatum

Entoloma serrulatum
Spores

Entoloma serrulatum
Cheilocystidia

Entoloma serrulatum
Pileipellis



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Kuo, M. (2014, January). Entoloma serrulatum. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/entoloma_serrulatum.html