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Agrocybe pediades

[ Basidiomycota > Agaricales > Strophariaceae > Agrocybe . . . ]

by Michael Kuo

This cosmopolitan mushroom appears in grassy areas (lawns, pastures, meadows), and features a thin, yellow-brown cap, a skinny stem that lacks a ring, and a medium brown spore print. Several grass-loving mushrooms are similar, including Panaeolus foenisecii, with a pointier, darker brown cap that fades and becomes two-toned, and Agrocybe dura, which is a bit larger and features a white cap that can become yellowish with age.

Agrocybe pediades has a partial veil, but it is so ephemeral that you will need to be looking at buttons the size of pencil erasers to see it. Within a few hours, all evidence of the veil has usually disappeared.

Collections I have made in California, Colorado, and Illinois have demonstrated a color change to red or pink when a drop of KOH is applied to the cap surface; other Agrocybe species I have tested show no color change or a change to dull yellow.

Agrocybe semiorbicularis is a synonym.


Ecology: Saprobic; growing alone or gregariously in lawns, meadows, and other grassy areas (also sometimes on woodchips, manure, or compost); summer, or nearly year-round in warm climates; originally described from Europe; common and widely distributed in North America; also found in the Caribbean, South America, Asia, and Oceania. The illustrated and described collections are from California, Colorado, and Illinois.

Cap: 1–3 cm across; convex, becoming broadly convex or nearly flat; bald; sometimes sticky when fresh; dark honey yellow, fading to pale brownish yellow; often with a thin strip of white partial veil remnants on the margin when very young.

Gills: Narrowly attached to the stem; close or nearly distant; short-gills frequent; pale yellow brown becoming darker brown; when young covered by an ephemeral white partial veil.

Stem: 2–8 cm long; 2–4 mm thick; more or less equal; bald or finely fibrillose; colored like the cap; sometimes twisted; basal mycelium white.

Flesh: Whitish; not changing when sliced; thin.

Odor and Taste: Odor not distinctive, or mealy; taste usually mealy.

Chemical Reactions: KOH on cap surface red to pink.

Spore Print: Dull brown with a hint of cinnamon.

Microscopic Features: Spores 10–18 x 7–10 µm; ellipsoid, with one end flattened for a 2 µm pore; smooth; golden brown in KOH; brown in Melzer's reagent. Basidia 25–30 x 8–10 µm; subclavate; 4-sterigmate. Pleurocystidia usually absent; when present scattered and rare; to 30 x 10 µm; lageniform, sometimes with a slight apical knob of encrusting material; smooth; hyaline in KOH. Cheilocystidia 30–50 x 7–14 µm; lageniform, sometimes with a subcapitate or capitate apex; thin-walled; smooth; hyaline in KOH. Pileipellis hymeniform; usually gelatinized; golden brown in KOH; terminal cells 20–30 x 5–10 µm, clavate to pyriform.

REFERENCES: (Fries, 1821) Fayod, 1889. (Smith, Smith & Weber, 1979; Phillips, 1981; Watling, 1982; Arora, 1986; Phillips, 1991/2005; Lincoff, 1992; Roody, 2003; Nauta, 2005; McNeil, 2006; Miller & Miller, 2006; Trudell & Ammirati, 2009; Malysheva et al., 2011; Buczacki et al., 2012; Kuo & Methven, 2014; Desjardin, Wood & Stevens, 2015; Siegel & Schwarz, 2016; Ryman, 2018; Læssøe & Petersen, 2019; Calaça et al., 2020; Niveiro et al., 2020.) Herb. Kuo 05039602, 06120201, 01030520, 08060501, 05020601, 05120607.

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


Agrocybe pediades

Agrocybe pediades

Agrocybe pediades

Agrocybe pediades

Agrocybe pediades

Agrocybe pediades

Agrocybe pediades

Agrocybe pediades
Spore print

Agrocybe pediades

Agrocybe pediades

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Kuo, M. (2020, October). Agrocybe pediades. Retrieved from the MushroomExpert.Com Web site: