Public Description of Agaricus xanthodermus Genev.

Title: Public Description
Name: Agaricus xanthodermus Genev.
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Description status: Unreviewed

Taxonomic Classification:

Domain: Eukarya
Kingdom: Fungi
Phylum: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Agaricaceae

General Description:

Cap: 6-20 cm; round to irregularly convex, becoming broadly convex or nearly flat; whitish, or with light brown colorations, especially towards the center; dry; bald, or with scattered fibrils; usually bruising yellow when rubbed, especially near the margin—the bruised areas then changing to brownish after some time has elapsed; the margin inrolled when young.

Gills: Free from the stem; white at first, then pinkish, and finally dark chocolate brown; close; when in the button stage, covered with a membranous white or yellowed partial veil that has patches of tissue on its underside.

Stem: 5-18 cm long; 1-3 cm thick; more or less equal; sometimes enlarged at the base; smooth; whitish, bruising yellow (then brownish); sometimes brownish in age; stuffed or hollowing; with a large, flaring, thick, yellow-staining ring on the upper portion.

Flesh: White and thick; yellowing when crushed; bright yellow in the base of the stem when sliced.

Odor and Taste: Odor unpleasant and phenolic, but sometimes faint; crush the flesh in the stem base to be sure.

Chemical Reactions: Cap surface yellow with KOH.

Spore Print: Dark chocolate brown.

Microscopic Features: Spores 4.5-6 × 3-4.5 µ; ellipsoid; smooth.


widely distributed in North America


Saprobic; growing scattered or in large groups, sometimes clustered together; in grass and in cultivated areas; occasionally in woods; summer and fall

Look Alikes:

Agaricus species


Kuo, M. (2002, August). Agaricus xanthodermus. Retrieved from the MushroomExpert.Com Web site:


Current Name:
Agaricus xanthodermus Genev., Bull. Soc. bot. Fr. 23: 28 (1876)

Agaricus meleagris var. grisea (A. Pearson) Wasser, Ukr. bot. Zh. 35(5): 516 (1978)
Agaricus pseudocretaceus Bon, Docums Mycol. 15(no. 60): 34 (1985)
Agaricus xanthodermus Genev., Bull. Soc. bot. Fr. 23: 28 (1876) subsp. xanthodermus
Agaricus xanthodermus var. antibioticus Cleland & J.R. Harris, Recds S. Austral. Mus. 9(1): 45 (1948)
Agaricus xanthodermus var. croceus Raithelh., Hong. Argentin. 1: 145 (1974)
Agaricus xanthodermus var. griseus (A. Pearson) Bon & Cappelli, Docums Mycol. 13(no. 52): 16 (1983)
Agaricus xanthodermus var. lepiotoides Maire, Bull. Soc. mycol. Fr. 24: LVIII (1910)
Agaricus xanthodermus var. macrosporus Aparici & Mahiques, Butlletí, Societat Micològica Valenciana 2: 27 (1996)
Agaricus xanthodermus var. meleagrioides (A. Pearson) Bon & Cappelli [as ‘meleagroides’], Docums Mycol. 13(no. 52): 16 (1983)
Agaricus xanthodermus Genev., Bull. Soc. bot. Fr. 23: 28 (1876) var. xanthodermus
Fungus xanthoderma (Genev.) Kuntze, (1898)
Fungus xanthodermus (Genev.) Kuntze, Revis. gen. pl. (Leipzig) 3(2): 480 (1898)
Pratella xanthoderma (Genev.) Gillet, Tabl. analyt. Hyménomyc. France (Alençon): 129 (1884)
Psalliota flavescens Richon & Roze, Fl. champ. com. ven.: 42 (1885)
Psalliota grisea (A. Pearson) Essette, Psalliotes: tab. 42 (1964)
Psalliota xanthoderma (Genev.) Richon & Roze, Fl. champ. com. ven.: 53 (1885)
Psalliota xanthoderma var. grisea A. Pearson, Trans. Br. mycol. Soc. 29(4): 204 (1946)
Psalliota xanthoderma var. lepiotoides (Maire) Rea, Brit. basidiomyc. (Cambridge): 85 (1922)
Psalliota xanthoderma var. meleagrioides A. Pearson, 33: 310 (1950)
Psalliota xanthoderma (Genev.) Richon & Roze, Fl. champ. com. ven.: 53 (1885) var. xanthoderma

Description author: walt sturgeon (Request Authorship Credit)

Created: 2014-01-10 16:39:06 UTC (+0000) by walt sturgeon (Mycowalt)
Last modified: 2014-01-10 16:39:06 UTC (+0000) by walt sturgeon (Mycowalt)
Viewed: 107 times, last viewed: 2019-11-15 01:55:02 UTC (+0000)