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Lactarius substriatus

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

by Michael Kuo

This West-Coast milky cap features white milk that turns yellow when exposed to air, along with an orange to brownish orange cap that does not feature concentric zones of color but does feature a faintly lined margin. There are several similar species, including Lactarius subflammeus (with non-yellowing milk), Lactarius xanthogalactus (somewhat larger and drier, with a zoned cap), and Lactarius subviscidus (milk not yellowing as readily, cap margin not lined, limited to association with Sitka spruce).


Ecology: Mycorrhizal in coastal and montane forests, with precise mycorrhizal association undocumented; growing alone, scattered, or gregariously; fall and winter; northern California to Washington. The illustrated and described collection is from northern California.

Cap: 2-5 cm; convex at first, becoming flat or shallowly vase-shaped; moist or thinly sticky; bald; orange to brownish orange, with a paler margin; the margin usually faintly and widely lined.

Gills: Attached to the stem or running slightly down it; close; whitish, becoming pale orangish; not staining from the milk.

Stem: 3-5 cm long; up to 1.5 cm thick; pale orange; more or less equal; bald; without pot-holes.

Flesh: Buff white, turning quickly yellow when sliced.

Milk: White, turning yellow on exposure to air; staining tissues yellow.

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

Spore Print: White to yellowish.

Chemical Reactions: KOH yellow on cap surface.

Microscopic Features: Spores 6-8 x 6-7 µ; subglobose to very broadly ellipsoid; ornamented with amyloid ridges and prominences extending 0.5-1 µ high, forming partially reticulated areas. Pleuromacrocystidia lageniform; often with a constriction. Pileipellis an ixotrichoderm.

REFERENCES: A. H. Smith, 1960. (Hesler & Smith, 1979; Methven, 1997.) Herb. Kuo 01130501.

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Lactarius substriatus

Lactarius substriatus

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Kuo, M. (2015, May). Lactarius substriatus. Retrieved from the MushroomExpert.Com Web site: