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Amanita species 02: The Little Brown Amanita
by Michael Kuo
I find this tiny Amanita in June and July, growing in soil or moss on oak-hickory ridgetops in central Illinois. It is a tiny, brownish species with a basal bulb and a volva that adheres tightly to the bulb except for a tiny extension (a "limb," in Mycologese) at the top. Under the microscope, its spores are amyloid and nearly round. It is very reminiscent of a miniature version of Amanita brunnescens.
Cap: 15-40 mm; convex becoming planoconvex; pale brown to grayish brown with a darker center; somewhat radially streaked; the margin not lined; bald; usually without universal veil remnants but occasionally with a few whitish to grayish patches.
Gills: Free from the stem; crowded; with frequent short-gills; white.
Stem: To 60 x 7 mm; more or less equal; terminating in a small, nearly round basal bulb measuring about 10-15 x 10-15 mm; whitish; sometimes discoloring a little brownish on handling; fairly bald; with a thin, high, white ring that flares upwards or hangs skirtlike; with an adherent white volva that extends as a limb for a few millimeters.
Flesh: White; unchanging.
Odor: Not distinctive.
Spore Print: White.
Chemical Reactions: KOH on cap surface negative.
Microscopic Features: Spores 5-9.5 µ; globose or subglobose; smooth; amyloid. Basidia 4-spored (rarely 2-spored); unclamped. Pileipellis a slightly gelatinized cutis of elements 2.5-7.5 µ wide. Lamellar trama bilateral; subhymenium subcellular to cellular.
REFERENCES: Herb. Kuo 06130204, 06010403, 05310708, 07080701, 07140701, 07200704, 07270701, 06270804.
Cite this page as:
Kuo, M. (2013, May). Amanita sp. 02: The little brown amanita. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/amanita_sp_02.html