Page author: Wynn Tranfield
Armillaria ostoyae
dark honey fungus, honey mushroom

Habitat: Under conifers

Conservation Status: Not of concern

Identification Notes:

A. ostoyae probably is our most common honey mushroom. It usually grows in clusters, mostly on conifers, but also on broad-leaved trees and shrubs such as willow and salmonberry; both the clusters and the individual mushrooms can be quite large. The caps are brown and usually covered with dark scales, a fairly well defined brownish ring is present on most fuitbodies, and the stipes often taper to pointed bases where they fuse in clusters. At other times, the bases may be somewhat enlarged. A. sinapina differs only slightly in appearance, with a cobwebby veil and slightly smaller cap scales, grows singly or in clusters of only a few individuals, and in the PNW appears to also grow primarily on conifers. Its most distinctive feature in eastern North America, the bright yellow color of its veil, is lacking, or at least inconsistent, in PNW specimens. Thus, this species often cannot be distinguished from A. ostoyae. A. ostoyae is a virulent pathogen of conifers, and, although edible when young, is considered worth collecting by relatively few mycophagists.

Accepted Name:
Armillaria ostoyae (Romagn.) Herink

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Armillaria ostoyae in the Consortium of Pacific Northwest Herbaria database.

CalPhotos: Armillaria ostoyae photos.

2 photographs:
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