Public Description of Suillus subaureus (Peck) Snell

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Name: Suillus subaureus (Peck) Snell
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Description status: Unreviewed

Taxonomic Classification:

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

General Description:

Cap: 3-17 cm; convex becoming broadly convex or flat; slimy and yellow underneath scattered brownish to reddish, appressed fibers and down; often developing a reddish-spotted or streaked appearance; when young with a cottony to felty roll of marginal tissue that sometimes persists into maturity as an inrolled sterile margin. The cap stains waxed paper bright yellow.

Pore Surface: Pale orange to orange or yellowish; not bruising; pores angular and radially arranged, about 2 per mm across; tubes to 1 cm deep.

Stem: 4-8 cm long; 1-2 cm thick; more or less equal; sticky when young; yellowish, discoloring brownish on handling; by maturity with visible brownish glandular dots; without a ring.

Flesh: Yellow; not staining on exposure, or staining pinkish to reddish.

Odor and Taste: Not distinctive.

Chemical Reactions: Ammonia on cap surface olive to red or pinkish; on flesh reddish to pinkish. KOH negative to bluish on cap surface; pinkish, grayish, or purplish on flesh. Iron salts negative on cap surface; olive to negative on flesh.

Spore Print: Olive brown.

Microscopic Features: Spores 7-10 × 3-4 µ; smooth; subfusoid.


Eastern North America


Under aspen, oak and pine

Apparently mycorrhizal with quaking aspen and big-toothed aspen, as well as eastern white pine; occasionally reported under scrub oak; growing alone, scattered, or gregariously; summer and fall;

Look Alikes:

Suillus hirtellus


Kuo, M. (2007, December). Suillus subaureus. Retrieved from the MushroomExpert.Com Web site:


Suillus subaureus (Peck) Snell, Lloydia 7: 30 (1944)

Boletus subaureus Peck 1887

Description author: walt sturgeon (Request Authorship Credit)