|Major Groups > Gilled Mushrooms > Pale-Spored > Lactarius > Lactarius olympianus|
by Michael Kuo
Here is a gorgeous western Lactarius recognized by a combination of features:
Lactarius olympianus is reminiscent of several other species in the "Lactarius zonarius" group, including the eastern, hardwood-associated Lactarius psammicola and the European species Lactarius zonarioides.
Ecology: Mycorrhizal with high-elevation spruces; summer and fall; Colorado to the Pacific Northwest. The illustrated and described collections are from Colorado.
Cap: 2-10 cm; convex with an incurved margin when young, becoming flat, shallowly depressed, or shallowly vase-shaped; slimy to sticky when wet; fairly bald; the margin not hairy, even when young; bright orange with concentric zones of paler orange.
Gills: Attached to the stem or running down it; close or nearly distant; whitish at first, becoming yellowish or orangish; developing orangish brown to brown stains and discolorations.
Stem: 2-5 cm long; up to 2 cm thick; more or less equal, or with a tapered base; dry or moist; without potholes; smooth; white; discoloring brownish to dingy orangish or yellowish where handled.
Flesh: White; not changing when sliced, or developing rusty stains.
Milk: White; not changing when exposed to air; staining the gills brownish to orangish brown.
Odor and Taste: Odor not distinctive; taste strongly acrid.
Chemical Reactions: KOH on cap surface negative.
Spore Print: Reported as creamy white.
Microscopic Features: Spores 7-10 x 8-11 µ; subglobose; ornamentation as amyloid warts and ridges 0.25-0.5 µ high, forming partial reticula. Pleuromacrocystidia not found. Cheilocystidia filiform to aciculate; to about 30 µ long. Pileipellis an ixocutis.
Further Online Information:
Cite this page as:
Kuo, M. (2016, June). Lactarius olympianus. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/lactarius_olympianus.html