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Amanita rhopalopus

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

by Michael Kuo

I call them "chloridellas"--the stinky, chlorine-reminiscent species of section Lepidella in the genus Amanita. This particular species is distinguished by its very long and rooting stem, its ephemeral ring, and its white to brownish patches or warts. Amanita ravenelii can appear very similar, but has warts that are positioned on a bed of radially fibrillose, cottony material (additionally, it usually has a less substantial ring and a fatter, scaly bulb).


Ecology: Mycorrhizal with oaks; usually growing alone or scattered, but sometimes growing gregariously; summer and fall; probably widely distributed in eastern North America below the Great Lakes, but more common in the Appalachians.

Cap: 4-18 cm; convex, expanding to planoconvex or flat; dry; white; adorned, especially over the center, with whitish to brownish patches or warts that are discrete from the material beneath them; the margin not lined.

Gills: Free from the stem or slightly attached to it; close or crowded; white to faintly yellowish; with frequent short-gills.

Stem: 6-20 cm long; 1-2.5 cm thick; more or less equal above a spindle-shaped (or occasionally more rounded) basal bulb that extends far into the ground; white; covered with soft, cottony veil material; with a delicate ring (often missing); with powdery universal veil remnants of soft and indistinct, vaguely concentric bands.

Flesh: White; not staining on exposure.

Odor: Strong and somewhat foul; reminiscent of chlorine and rotting meat.

Spore Print: White.

Microscopic Features: Spores 6-11 x 4.5-6.5 µ; ellipsoid; smooth; amyloid. Basidia 2- and 4-spored; basally clamped. Pileipellis an ixocutis of elements 2-10 µ wide. Lamellar trama bilateral; subhymenium ramose, or with inflated cells.

REFERENCES: Bas, 1969. (>Saccardo, 1902 [radicata]; Bas, 1969; Jenkins, 1986; Phillips, 1991/2005; Metzler & Metzler, 1992; Barron, 1999; Tulloss, 2013.) Herb. Kuo 09031203.

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Amanita rhopalopus

Amanita rhopalopus

Amanita rhopalopus

Amanita rhopalopus

Amanita rhopalopus

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