Major Groups > Gilled Mushrooms > Pale-Spored > Lactarius > Lactarius deterrimus


Lactarius deterrimus

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

by Michael Kuo

This messy European species is close to Lactarius deliciosus, but differs in several important ways: it grows under spruces (rather than pines), its stem lacks pot-holes, and its cap is usually less zoned and more prone to green staining. Lactarius fennoscandicus is another similar European species, also associated with spruces; its cap is usually more zonate and more brown, and its spores are slightly smaller. Lactarius deterrimus can be found throughout Europe, wherever spruces occur.


Ecology: Mycorrhizal with spruces; growing alone, scattered, or gregariously; summer and fall; widely distributed in Europe where spruces occur. The illustrated and described collection is from Italy.

Cap: 6–10 cm; convex at first, becoming more or less flat, or shallowly depressed; sticky; bald; bright orange when young, fading to dull orange and developing green stains; not zoned, or very faintly zoned near the margin; the margin not lined.

Gills: Broadly attached to the stem or beginning to run down it; close; short-gills frequent; orange; developing green stains.

Stem: 3–5 cm long; up to 1.5 cm thick; slightly tapered to the base; without potholes; bald; orange overall, with a thin white zone at the apex; developing green stains.

Flesh: Dirty orange; staining slowly reddish orange.

Milk: Carrot orange, becoming reddish after 10 minutes or more; scant.

Odor and Taste: Not distinctive.

Spore Print: Undocumented by me; reported as "pale pinkish buff" by Heilmann-Clausen et al., 2000.

Microscopic Features: Spores 7–10 x 6.5–7.5 µm; ellipsoid; ornamented with amyloid warts and ridges extending up to about 0.5 µm high; connectors fairly frequent, forming partially reticulate patterns. Cheilomacrocystidia narrowly fusiform; to about 60 x 7.5 µm. Pleuromacrocystidia scattered; inconspicuous; narrowly fusiform; barely projecting. Pileipellis an ixocutis; elements 2.5–5 µm wide.

REFERENCES: Gröger, 1968. (Nilsson & Persson, 1978; Phillips, 1981; Heilmann-Clausen et al., 2000; Kränzlin, 2005; Nuytinck & Verbeken, 2005; Verbeken & Vesterholt, 2008.) Herb. Kuo 10141408.

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


Lactarius deterrimus

Lactarius deterrimus

Lactarius deterrimus

Lactarius deterrimus

Lactarius deterrimus
Spores (fine focus rolled to show ornamentation height)

© MushroomExpert.Com

Cite this page as:

Kuo, M. (2016, January). Lactarius deterrimus. Retrieved from the MushroomExpert.Com Web site: