Public Description of Suillus caerulescens A.H. Sm. & Thiers

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Name: Suillus caerulescens A.H. Sm. & Thiers
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Description status: Unreviewed

Taxonomic Classification:

Domain: Eukarya
Kingdom: Fungi
Phylum: Basidiomycota
Class: Agaricomycetes
Order: Boletales
Family: Boletaceae

General Description:

Cap: 6-14 cm; convex becoming broadly convex or flat; moist or fairly slimy; smooth or with patches of appressed fibers or scales; yellowish brown to tawny or cinnamon brown; the margin sometimes hung with partial veil remnants.

Pore Surface: Yellowish; bruising slowly reddish brown; pores angular and radially arranged (but not boletinoid), about 1-2 mm across; tubes to about 1 cm deep.

Stem: 3-8 cm long; 2-3 cm thick; more or less equal, or tapered in either direction; solid; often finely reticulate near the apex; smooth or with appressed hairs; lacking glandular dots; yellowish above, dingy to brownish below; bruising brown; with a whitish, dry ring that soon collapses or disappears entirely.

Flesh: Pale yellow; staining blue in the stem base when exposed, elsewhere not staining or staining pinkish to brownish.

Odor and Taste: Mild or slightly acidic.

Chemical Reactions: Ammonia grayish on cap; pale grayish lilac on flesh. KOH olive gray becoming dark gray on cap; dark gray on flesh. Iron salts olive on cap; olive to bluish on flesh.

Spore Print: Cinnamon brown.

Microscopic Features: Spores 8-11 × 3-5 µ; smooth; subfusoid.


Pacific NW and Calif.

Mycorrhizal with Douglas-fir and other conifers; growing alone or gregariously; fall and winter; western North America.

Look Alikes:

Suillus imitatus has a cap that is “glabrous or practically so, if fibrillose-streaked the fibrils beneath the gluten” (Smith & Thiers, 1964). It also has a slimy, yellowish partial veil, and slightly shorter spores (7-9 µ long). Suillus imitatus var. viridescens develops greenish to olive or bluish shades on the cap surface.




Kuo, M. (2005, March). Suillus caerulescens. Retrieved from the MushroomExpert.Com Web site:


Current Name:
Suillus caerulescens A.H. Sm. & Thiers, Monogr. North Amer. Species Suillus: 36 (1964)

Description author: walt sturgeon (Request Authorship Credit)

Created: 2011-12-06 15:53:18 CST (-0500) by walt sturgeon (Mycowalt)
Last modified: 2013-12-28 21:45:34 CST (-0500) by walt sturgeon (Mycowalt)
Viewed: 43 times, last viewed: 2018-06-25 19:06:15 CDT (-0400)