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Amanita novinupta

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

by Michael Kuo

One of several "blushing" species of Amanita, Amanita novinupta is the western North American version of the European and Asian species Amanita rubescens--which may or may not be the same as the "Amanita rubescens" of eastern North America. Amanita novinupta is generally stockier than its eastern counterpart, and its cap is initially white. As it matures the cap begins to "blush," and pinkish areas develop, seemingly below a translucent surface. By maturity the cap can be pinkish to brownish.

Thanks to Wendell Wood for collecting, documenting, and preserving Amanita novinupta for study; his collection is deposited in The Herbarium of Michael Kuo.


Ecology: Mycorrhizal with hardwoods, especially coast live oak--but also associated with Douglas-fir and other conifers; growing alone, scattered, or gregariously; fall, winter, and spring; California to British Columbia, and in Arizona and New Mexico.

Cap: 3-15 cm; round, becoming convex or nearly flat; dry; the surface appearing dusted or chalky at first, but later becoming shiny or satiny; white at first, developing pink shades that can seem to originate from beneath the translucent surface; eventually pinkish to tan; bruising and discoloring pale pinkish or darker reddish brown; universal veil taking the form of whitish to pale pink warts or one to several patches; the margin not lined, sometimes hung with a few veil remnants.

Gills: Free from the stem or slightly attached to it; whitish; close or crowded; bruising pinkish.

Stem: 2-15 cm long; 1-3 cm thick; slightly tapering to apex; usually with a prominent basal bulb; more or less smooth, or finely scaly; white; bruising pinkish to reddish; with a white, skirtlike ring; occasionally with a few universal veil remnants near the base, but without a prominent volva; solid or partially hollow in age.

Flesh: White throughout; staining pinkish to reddish on exposure.

Odor: Not distinctive.

Chemical Reactions: KOH negative on cap surface.

Spore Print: White.

Microscopic Features: Spores 8-11 x 5.5 - 7 µ; smooth; ellipsoid; amyloid. Basidia 4-spored; sometimes clamped. Pileipellis an ixocutis of elements 2-8 µ wide. Lamellar trama bilateral; subhymenium inflated-ramose.

REFERENCES: Tulloss & Lindgren, 1994. (Arora, 1986 ["rubescens"]; Tulloss, 2013.) Herb. Kuo 07171101.

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Amanita novinupta

Amanita novinupta

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