|Major Groups > Gilled Mushrooms > Pale-Spored > Lactarius > Lactarius montanus|
by Michael Kuo
This mushroom is the western North American version of the eastern Lactarius uvidus. It associates with conifers and willows in wet montane ecosystems, and features a stockier stem and a drier cap surface than the eastern North American species. Like its eastern counterpart it has a cap that turns green when a drop of KOH is applied, and copious white milk that stains tissues lilac purple.
Ecology: Mycorrhizal with conifers and with willows, in wet montane ecosystems; summer and fall; Rocky Mountains, Cascade Mountains, and the Sierra Nevada.
Cap: 3-11 cm; convex with an incurved margin when young, becoming flat or shallowly depressed; sticky when very fresh but soon dry; bald; finely rugged; brownish lilac to lilac brown or brownish purple or purplish gray; without concentric zones of color, or occasionally with faint zones.
Gills: Broadly attached to the stem or beginning to run down it; close; whitish to creamy; stained lilac to purple (eventually brownish) by the milk where damaged.
Stem: 3-10 cm long; 1-3 cm thick; club-shaped, becoming more or less equal with maturity; dry or slightly sticky when fresh; without potholes; whitish to purplish buff; often stained yellow in places, especially near the base; bruising and discoloring lilac to purple.
Flesh: White; staining lilac when sliced.
Milk: White; copious; staining tissues lilac to purple.
Odor and Taste: Odor fragrant or not distinctive; taste not distinctive, or faintly resinous.
Spore Print: Yellowish.
Chemical Reactions: KOH green on cap surface.
Microscopic Features: Spores 8-12 x 6-9 µ; broadly ellipsoid; ornamentation mostly under 0.5 µ high; connectors sometimes forming partial reticula. Macropleurocystidia up to about
Lactarius uvidus var. montanus is a former name.
Further Online Information:
Lactarius uvidus var. montanus in Hesler & Smith (1979)
Cite this page as:
Kuo, M. (2011, February). Lactarius montanus. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/lactarius_montanus.html