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Infundibulicybe gibba

[Basidiomycota > Agaricales > Tricholomataceae > Infundibulicybe...]

by Michael Kuo

Infundibulicybe gibba is a common clitocyboid mushroom featuring a pale pinkish tan cap that becomes fairly deeply vase-shaped by maturity. Its pale, crowded gills run down the stem, which is usually pale in comparison to the cap. Other distinctive features include the white mycelium on the stem base and, under the microscope, teardrop-shaped spores. Infundibulicybe gibba is found in the woods of Europe and North America, usually in hardwood forests but occasionally under conifers.

The similar Infundibulicybe squamulosa is found primarily under conifers and features a somewhat darker cap and stem, a finely scaly cap center, and slightly smaller spores; it appears to be widespread in Europe and North America. Other look-alike species in Europe include Infundibulicybe cosatata (with a more consistently ribbed cap margin, darker colors, and a brown KOH reaction in herbarium specimens) and Infundibulicybe bresadolana (darker, and also with a brown KOH reaction).

Clitocybe gibba is a synonym.


Ecology: Saprobic; growing scattered or gregariously; primarily found under hardwoods (especially oaks) but sometimes reported under conifers; summer and fall (or over winter and spring in warm climates); originally described from Denmark; widely distributed in boreal and temperate Europe; widespread in North America from Alaska to Newfoundland and Labrador, south into Mexico; sometimes reported from Asia. The illustrated and described collections are from France, Illinois, and Wisconsin.

Cap: 2–7 cm; at first flat or with a shallow central depression, becoming deeply vase-shaped, sometimes with a small bump in the center; bald or very finely silky; dry or slightly moist; pinkish tan, or yellowish; fading with age; sometimes with a wavy margin at maturity; the margin sometimes slightly ribbed.

Gills: Running down the stem; close or crowded; cream colored; short-gills frequent.

Stem: 2–6 cm long; up to 1 cm thick; equal above a slightly swollen base; dry; fairly bald; whitish, off-white, or a pale version of the cap color; becoming hollow; base covered with white mycelium.

Flesh: Thin; whitish; unchanging when sliced.

Odor and Taste: Odor not distinctive, or sometimes sweet; taste not distinctive.

Chemical Reactions: KOH on fresh cap surface sometimes fleetingly pale green; on cap surface of dried herbarium specimens negative.

Spore Print: White.

Microscopic Details: Spores 5–7 x 3–4 µm; lacrymoid (ellipsoid to elongated-ellipsoid, with a suprahilar depression); smooth; inamyloid; hyaline in KOH; sometimes adhering in twos, threes, and fours. Basidia 25–28 x 4–5 µm; narrowly clavate; 4-sterigmate. Cystidia not found. Pileipellis a cutis of elements 2.5–8 µm wide, smooth, hyaline in KOH; clamp connections present.

REFERENCES: (C. H. Persoon, 1801) H. Harmaja, 2003. (Fries, 1821; Harmaja, 1969; Smith, Smith & Weber, 1979; Phillips, 1981; Bigelow, 1982; Arora, 1986; States, 1990; Breitenbach & Kränzlin, 1991; Schalkwijk-Barendsen, 1991; Lincoff, 1992; Metzler & Metzler, 1992; Kuyper, 1995; Evenson, 1997; Barron, 1999; Harmaja, 2003; Roody, 2003; McNeil, 2006; Miller & Miller, 2006; Gregory, 2007; Nonis, 2007; Vizzini et al., 2011; Buczacki et al., 2013; Kuo & Methven, 2014; Evenson, 2015; Baroni, 2017; Gminder & Böhning, 2017; Sturgeon, 2018; Vesterholt, 2018; Læssøe & Petersen, 2019; Kibby, 2020; McKnight et al., 2021.) Herb. Kuo 07100302, 06041305, 09241807.

This website contains no information about the edibility or toxicity of mushrooms.


Infundibulicybe gibba

Infundibulicybe gibba

Infundibulicybe gibba

Infundibulicybe gibba
KOH on herbarium specimen

Infundibulicybe gibba

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Kuo, M. (2022, April). Infundibulicybe gibba. Retrieved from the MushroomExpert.Com Web site: