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Amanita pelioma

[ Basidiomycetes > Agaricales > Amanitaceae > Amanita . . . ]

by Michael Kuo

Amanita pelioma is a messy, grayish to olive or brownish buff Amanita with gills the color of café au lait and a blue-staining stem base. These features alone will reliably separate the species from other amanitas--at least, according to current definitions. Most authors report the species as fairly rare, occurring under pines and oaks in the southeastern United States from eastern Texas to West Virginia. I find it with some regularity in Illinois, where it appears under oaks.

Amanita pelioma has a large, thick ring which, despite its size, is easily lost early on in development--perhaps leading some authors to designate it as a ringless species.


Ecology: Mycorrhizal with oaks (but sometimes reported under pines); usually solitary or scattered; summer and fall; distributed from eastern Texas to Illinois, North Carolina, and West Virginia.

Cap: 4-9 cm; convex, becoming broadly convex or nearly flat; moist or dry; covered with abundant, whitish, powdery material that comes off on handling; whitish to grayish or brownish buff, or with olive hues; the margin not lined, but often somewhat shaggy.

Gills: Free from the stem or nearly so; close or nearly crowded; creamy becoming brownish (the color of café au lait) or olive buff; short-gills frequent.

Stem: 6-15 cm long; up to 2 cm thick; tapering slightly to the apex; colored like the cap and covered with similar powdery material; with a large, skirtlike, fragile, whitish ring that usually disappears; terminating in a turnip-shaped basal bulb that often features a tapering "root" (up to 8 cm or more long); with powdery, indistinct volval remnants; stained bluish to greenish blue near the base.

Flesh: White; unchanging when sliced.

Odor: Not distinctive at first, becoming foul and unpleasant with age.

Chemical Reactions: KOH on cap surface at first negative, becoming faintly blue after 30 minutes.

Spore Print: White.

Microscopic Features: Spores 8-12 x 5-8 µ; smooth; ellipsoid; amyloid. Basidia 4-spored; lacking basal clamps. Pileipellis an ixocutis of hyphae 2-15 µ wide. Lamellar trama bilateral; subhymenium ramose or with inflated elements.

REFERENCES: Bas, 1969. (Jenkins, 1986; Metzler & Metzler, 1992; Tulloss et al., 1995; Kuo & Methven, 2010; Tulloss, 2013.) Herb. Kuo 08310501, 06280704, 07200804.

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Amanita pelioma

Amanita pelioma

Amanita pelioma

Amanita pelioma

Amanita pelioma

Amanita pelioma

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Kuo, M. (2013, May). Amanita pelioma. Retrieved from the MushroomExpert.Com Web site: