Suillus cavipes (Opat.) A.H. Sm. and Thiers
hollow-stalked larch Suillus

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

Introduction to the Macrofungi


© Michael Beug     (Photo ID #14995)


E-Flora BC Static Map

Distribution of Suillus cavipes
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Species Information

Chemical Reactions:
cap surface black with application of KOH (Bessette)
not distinctive (Bessette, Smith(34))
not distinctive (Bessette, Smith(34))
spores 7-10 x 3.5-4 microns, narrowly oval to ventricose, smooth, pale brown, (Bessette), spores 7-10 x 3.5-4 microns, narrowly oval to ventricose, smooth, nearly colorless in Melzer's reagent and greenish transparent in KOH; basidia 4-spored, 18-35 x 4-5 microns, colorless in KOH; pleurocystidia scattered to numerous, 42-56 x 6-10 microns, subcylindric to fusoid-ventricose, colorless, thin-walled, cheilocystidia similar or obventricose; cap cuticle a deep loose trichodermium of hyphae 8-15 microns wide, the cells more or less equal or narrowed at cross walls, colorless in KOH, yellow in Melzer's reagent; clamp connections present, (Smith(34)), spores 7-10 x 3.5-4 microns, elliptic to spindle-shaped, (Arora)
Spore Deposit:
brown, (Bessette), dark olive-brown when moist, (Smith(34)), dark olive to brown (Arora), olivaceous (Phillips)
yes (Bessette)

Habitat and Range

Suillus lakei lacks hollow stem, is associated with Douglas-fir, and lacks clamp connections. Other boletes under larch include Suillus grevillei, S. ochraceoroseus, and S. viscidus: these also lack clamp connections.
scattered or in groups on ground under larch in forests and bogs, (Bessette), gregarious to cespitose [in tufts] under larch, (Smith(34)), late summer and fall, (Miller)