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Russula eccentrica

[ Basidiomycota > Russulales > Russulaceae > Russula . . . ]

by Michael Kuo

This distinctive russula appears in late summer from the southern Appalachian Mountains to Missouri and the Gulf Coast. It features a brownish cap, distantly-spaced pink gills, and pinkish flesh in the stem. The "skin" on the cap surface is tightly affixed, and does not peel away easily--and, under the microscope, it features spores with very low ornamentation that sometimes forms faint reticulate patterns.

On the West Coast the name "Russula eccentrica" has sometimes been applied to a similar, oak-associated species with pink-bruising surfaces and gills that are white before bruising; Arora and Nguyen named that species Russula cantharellicola in 2014.

Description:

Ecology: Mycorrhizal with various trees, including eastern hemlock, American beech, oaks, and hickories; growing alone, scattered, or gregariously; summer and early fall; southeastern North America from the southern Appalachians to the Gulf Coast. The illustrated and described collections are from Ohio.

Cap: 5-8 cm; convex when young; becoming broadly convex, flat, or shallowly depressed; tacky to sticky when fresh; when young bald or nearly so, with a waxy feel when rubbed--becoming rougher and finely cracked to fibrillose; buff when young, maturing to pale brown; the margin not lined; the skin not peeling easily.

Gills: Broadly attached to the stem; distant or nearly so, at least by maturity; thick; short-gills present; pale pink to brownish pink; spotting brownish with age.

Stem: 5-8 cm long; 1-2 cm thick; slightly tapered to base; sometimes slightly off-center (hence the species name eccentrica); dry; bald; whitish; bruising pink and eventually brownish where handled (but according to Bills [1985] the stem surface does not actually bruise; instead, it erodes and exposes pink flesh beneath the surface); hollowing with age; basal mycelium white.

Flesh: Whitish in cap, pinkish in stem; unchanging when sliced.

Odor and Taste: Odor not distinctive; taste not distinctive, or slowly acrid.

Chemical Reactions: KOH negative on cap surface. Iron salts negative or slightly pink on stem surface.

Spore Print: Reported as white (Bills, 1985).

Microscopic Features: Spores 6-9 x 5-6 µ; ellipsoid; ornamentation under 0.5 µ high, as isolated amyloid warts and occasional connecting lines that may form partially reticulated areas. Cheilocystidia 30-40 x 2.5-5 µ; cylindric to filiform or subaciculate; smooth; thin-walled; hyaline to golden in KOH. Pleurocystidia similar. Pileipellis poorly defined; cutis-like; golden brown in KOH; elements 2.5-5 µ wide, smooth.

REFERENCES: Peck, 1911. (Burlingham, 1915; Saccardo, 1925; Bills, 1985; Weber & Smith, 1985 ["subnigricans"]; Kibby & Fatto, 1990; Roody, 2003; Binion et al., 2008.) Herb. Kuo 07181501, 07191508.

Thanks to Walt Sturgeon for teaching me this species.


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Russula eccentrica

Russula eccentrica

Russula eccentrica

Russula eccentrica

Russula eccentrica
Spores


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Cite this page as:

Kuo, M. (2017, May). Russula eccentrica. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/russula_eccentrica.html