Amanita sinicoflava

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by Michael Kuo

This subtly beautiful Amanita is a member of the Amanita vaginata group; like the other species in the group it lacks a ring and features a strongly lined cap margin, as well as a sacklike volva. Amanita sinicoflava can be separated from the others without a microscope on the basis of its "Chinese yellow" to olive tan or olive yellow cap and its volva, which usually stains gray to black by maturity. It often features a small, darker (and usually raised) area over the center of the cap. It is fairly widely distributed east of the Great Plains, and appears under hardwoods or conifers.

Description:

Ecology: Mycorrhizal with various conifers and hardwoods; growing alone or gregariously; summer and fall; fairly widely distributed east of the Great Plains.

Cap: 2.5-7 cm; bell-shaped, expanding to broadly bell-shaped, convex, or nearly flat; sticky or dry; sometimes with a few whitish or grayish patches that are easily lost; olive tan to olive yellow, often darker over the center; the margin prominently lined.

Gills: Free from the stem or nearly so; close or nearly crowded; whitish, developing grayish tones with age.

Stem: 6-14 cm long; up to just over 1 cm thick; tapering slightly to the apex; without a basal bulb; white; discoloring a little brownish on handling; base encased in a loose but fairly persistent sacklike volva that is initially white but discolors grayish to blackish with maturity, beginning with the upper edge.

Flesh: Whitish; unchanging.

Odor: Not distinctive.

Spore Print: White.

Chemical Reactions: KOH on cap surface negative.

Microscopic Features: Spores 8-15 µ; globose or subglobose; smooth; inamyloid. Basidia primarily 4-spored; without basal clamps. Pileipellis a cutis or ixocutis of filamentous hyphae. Lamellar trama bilateral; subhymenium ramose to cellular.

REFERENCES: Tulloss, 1988. (Phillips, 1991/2005; Roody, 2003; McNeil, 2006; Tulloss, 2013.) Herb. Kuo 09029505, 07110704, 07140702, 07011302.

Further Online Information:

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Kuo, M. (2013, May). Amanita sinicoflava. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/amanita_sinicoflava.html