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Lactarius scrobiculatus var. canadensis

[ Agaricomycetes > Russulales > Russulaceae > Lactarius . . . ]

by Michael Kuo

This northern and montane mushroom is probably not, actually, a variety of the European species Lactarius scrobiculatus, but we are stuck with the name for the time being. Defining features include the hairy cap margin, the prominent potholes on the stem, and the white milk that turns promptly yellow when exposed to air. The cap is whitish to olive buff (sometimes becoming yellowish by maturity) and it features fibrils that often darken to brown.


Ecology: Mycorrhizal with conifers; growing alone, scattered, or gregariously; summer and fall; widely distributed in northern and montane regions of North America.

Cap: 4-12 cm; broadly convex with an inrolled and bearded margin when young, becoming shallowly vase-shaped, with the margin uplifted and smoother; slimy when young, but soon dry; covered with fibers that may darken to brownish, the fibers remaining visible in maturity; whitish at first, becoming olive buff or yellowish in age; without concentric zones of color.

Gills: Beginning to run down the stem; crowded; often forking near the stem; whitish; bruising or staining yellowish to pale brownish.

Stem: 3-11 cm long; 1-3.5 cm thick; equal; with many glazed, yellowish or brownish potholes; whitish; bruising and discoloring yellowish or brownish.

Flesh: Whitish; firm.

Milk: White, promptly turning yellow on exposure to air; scanty.

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

Chemical Reactions: KOH negative to faintly orange on cap surface.

Spore Print: White or creamy.

Microscopic Features: Spores 7-9 x 5.5-7 µ; ellipsoid; ornamentation about 0.5 µ high, as amyloid warts and scattered short ridges that occasionally branch but to do not form reticula. Pleuromacrocystidia scattered; fusoid, often with an apical constriction; to about 80 x 12 µ. Cheilocystidia similar but shorter. Pileipellis an ixocutis with occasional fascicles of upright hyphae.

REFERENCES: (Smith, 1960) Hesler & Smith, 1979. (Methven, 1997; McNeil, 2006; Trudell & Ammirati, 2009.) Herb. Kuo 09120405.

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Lactarius scrobiculatus var canadensis

Lactarius scrobiculatus var canadensis

Lactarius scrobiculatus var canadensis

Lactarius scrobiculatus var canadensis

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Kuo, M. (2011, March). Lactarius scrobiculatus var. canadensis. Retrieved from the MushroomExpert.Com Web site: