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Lactarius peckii

[ Basidiomycota > Russulales > Russulaceae > Lactarius . . . ]

by Michael Kuo

Lactarius peckii is an eastern hardwood-associated milky cap with a dry, brick red to reddish orange cap, copious white milk, and dark gills. Gertrude Burlingham first named the species in 1908, designating a North Carolina collection as the type collection; she named the species for American mycologist Charles Peck, who had collected it previously without naming it.

Smith & Hesler (1979) described two varieties on the basis of color changes in the latex: Lactarius peckii var. glaucescens, with milk drying green; and Lactarius peckii var. lactolutescens, with milk turning slowly yellowish, then drying greenish.

Description:

Ecology: Mycorrhizal with oaks and other hardwoods; growing alone or gregariously; summer and fall; fairly widely distributed in eastern North America, but more common in the Appalachian Mountains. The illustrated and described collections are from Kentucky and Ohio.

Cap: 4-9 cm; convex with a slightly inrolled margin when young; becoming centrally depressed, with an uplifted margin; dry; bald or very finely velvety; brick red to dark orangish red or ruddy orange; with or without faint to moderate concentric zones of color.

Gills: Beginning to run down the stem; close or crowded; short-gills frequent; pale orange when young, darkening to brownish orange or brownish (eventually brown) with maturity; not staining where damaged.

Stem: 2.5-4 cm long; 1-2 cm thick; more or less equal; bald; without potholes; dry; pale, dull orange or darker orange.

Flesh: Orangish; fairly firm; unchanging when sliced.

Milk: Copious; white; not staining surfaces, but drying very slowly yellowish to greenish; staining white paper yellow overnight.

Odor and Taste: Odor not distinctive; taste quickly burning-acrid.

Chemical Reactions: KOH negative to yellowish on cap surface.

Spore Print: Reported as white by Hesler & Smith (1979).

Microscopic Features: Spores 5-6.5 x 5-6 µ; globose or subglobose; ornamentation consisting of amyloid warts and ridges extending 0.5-1 µ high, forming wide-meshed, partially reticulated areas. Hymenial macrocystidia 35-45 x 5-7.5 µ; long-fusiform; sometimes with an apical constriction; thin-walled; smooth. Pileipellis a cutis; orangish golden in KOH; elements cylindric, 2.5-5 µ wide, smooth.

REFERENCES: Burlingham, 1908. (Hesler & Smith, 1979; Weber & Smith, 1985; Phillips, 1991/2005; Lincoff, 1992; Roody, 2003; Binion et al., 2008.) Herb. Kuo 08111201.


Further Online Information:

Lactarius peckii in Hesler & Smith (1979)
Lactarius peckii at Roger's Mushrooms


This site contains no information about the edibility or toxicity of mushrooms.

 

Lactarius peckii

Lactarius peckii

Lactarius peckii

Lactarius peckii

Lactarius peckii

Lactarius peckii
Spores



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Kuo, M. (2016, December). Lactarius peckii. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/lactarius_peckii.html