Leccinum manzanitae Thiers
madrone bolete

Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.

Introduction to the Macrofungi


© Michael Beug     (Photo ID #14971)


E-Flora BC Static Map

Distribution of Leccinum manzanitae
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Species Information

Chemical Reactions:
flesh stains pale gray with FeSO4, tubes pale red with KOH then blackening, (Thiers)
not distinctive (Bessette), mild (Thiers(13))
not distinctive (Bessette), mild (Thiers(13))
spores 13-19 x 3-5 microns, spindle-shaped to elliptic, smooth, (Arora), spores 13-17 x 4-6 microns, fusoid to subcylindric [almost cylindric], smooth, ochraceous, (Bessette), spores 13-17 x 4-5.5 microns, (var. angustisporum distinguished only by spores that reach only 3-4 microns wide and often average 1-2 microns longer), fusoid to subelliptic to subcylindric, inequilateral, smooth, moderately thick-walled; basidia 4-spored, 27-32 x 6-9 microns, clavate to pyriform; hymenial cystidia often obscure, scattered, 23-32 x 4-6 microns, fusoid to clavate with narrow elongated apices, colorless in KOH; cap cuticle a trichodermium of free tangled hyphal tips, hyphae 8-12 microns wide, some disarticulation of cells, walls smooth to sometimes obscurely rough, pigment globules forming in cap cuticle hyphae when mounted in Melzer's, terminal cells elongated and often noticeably tapered; clamp connections absent, (Thiers(1))
Spore Deposit:
brown (Arora, Bessette), cinnamon-brown (Thiers(13))
reported by some authors including Bessette(3) as edible, but orange Leccinum species have been implicated in poisoning episodes

Habitat and Range

Arora and Bessette mention several other "manzanita boletes" that occur in California. Leccinum ponderosum is similar but associated with conifers: it typically has unchanging or only slightly changing flesh, and the cap is bald and not as deeply colored. A similar but (in 1971) undescribed species occurs above timberline with Arctostaphylos uva-ursi in Alaska, but L. manzanitae is "much darker colored, consistently larger in size, viscid, has different color changes in the exposed flesh and slightly smaller spores", (Thiers(13)).
singly to scattered or gregarious, under manzanita and madrone, (Arora), single, scattered, or in groups under madrone or manzanita (Bessette), fall