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Entoloma subserrulatum

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

by Michael Kuo

Little, brownish entolomatoid mushrooms are so ridiculously tedious that it's a real pleasure to find one with an interesting and distinctive feature to recommend it. Entoloma subserrulatum is only boring from the top; as soon as you turn it over you are treated to its beautifully contrasting, black, jagged gill edges. Originally described from New York state, Entoloma subserrulatum has since been documented from Tennessee, North Carolina--and, here, from Illinois. Additionally, it appears to be present in Québec, based on online photos.

Description:

Ecology: Saprobic; growing scattered to gregariously in moss under hardwoods; summer; possibly widely distributed in eastern North America (documented from New York, Tennessee, and North Carolina; the collection illustrated and described here is from Illinois).

Cap: 0.5-3 cm; convex with a central navel-like depression; silky-fibrillose overall, and finely scaly over the center; dry; dull grayish becoming yellowish gray; the margin becoming slightly lined with age.

Gills: Broadly attached to the stem; close; white at first, becoming pink; edges finely serrated and black; short-gills frequent.

Stem: 3-4 cm long; 1-3 mm thick; equal; dry; bald; whitish to faintly brownish or grayish; basal mycelium white.

Flesh: Thin; white; unchanging when sliced.

Odor and Taste: Odor slightly to strongly foul and unpleasant; taste not ascertained.

Chemical Reactions: KOH on cap surface yellowish.

Spore Print: Pink.

Microscopic Features: Spores 9-11 x 6-7 µ; 5- to 6-sided; heterodiametric; smooth; hyaline. Pleurocystidia absent. Lamellar edge sterile. Cheilocystidia abundant; cylindric-flexuous; 50-150 x 5-7.5 µ; apices rounded or subclavate; often forming bundles; often appearing "tramal" in origin. Pileipellis a cutis with areas of ascending to upright terminal elements; brown to brownish in 10% ammonia, with intracellular pigment. Clamp connections absent.

REFERENCES: (Peck, 1898) Hesler, 1967. (Saccardo, 1902; Hesler, 1963; Hesler, 1967.) Herb. Kuo 07300903.

 

Entoloma subserrulatum

Entoloma subserrulatum

Entoloma subserrulatum

Entoloma subserrulatum
Spores

Entoloma subserrulatum
Cheilocystidia



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