Public Description of Suillus tomentosus (Kauffman) Singer

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Name: Suillus tomentosus (Kauffman) Singer
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 Draft For Macrofungi Of The Pacific Northwest By Chaelthomas (Private)

Description status: Unreviewed

Taxonomic Classification:

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

General Description:

Cap: 5-15 cm; convex becoming broadly convex; sticky or fairly dry; at first covered with a fine, grayish, felty covering, but often becoming smoother with age; yellow to orangish yellow; sometimes developing reddish spots and stains; the margin at first inrolled.

Pore Surface: Brownish to cinnamon when young, becoming brownish yellow to olive yellow; bruising blue; 1-2 angular pores per mm; tubes to 2 cm deep.

Stem: 4-12 cm long; 1-3 cm thick; equal or somewhat club-shaped; yellowish orange; covered with brownish glandular dots; staining brownish on handling; without a ring.

Flesh: Whitish to yellowish in the cap; yellow in the stem; bluing on exposure.

Odor and Taste: Not distinctive.

Chemical Reactions: Ammonia reddish to grayish or negative on the cap surface; brownish on flesh. KOH pinkish, then purple on cap surface; dark brown on flesh. Iron salts greenish to grayish on cap surface; gray to brown on flesh.

Spore Print: Olive brown when fresh, drying cinnamon brown.

Microscopic Features: Spores 7-12 × 3-5 µ; smooth; subfusoid.


growing scattered or gregariously; summer and fall (also in winter in coastal California); widely distributed in North America but apparently rare or absent in the southeast.


Mycorrhizal with two-needle pines, especially lodgepole pine and jack pine;

Look Alikes:

Suillus variegatus found in Europe may be the same,
and Suillus reticulatus with reticulate stalk and is rare

Suillus punctipes has a fragrant odor and its pores do not bruise blue.




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


Current Name:
Suillus tomentosus (Kauffman) Singer, Mycologia 51(4): 570 (1960) 1959

Boletus tomentosus Kauffman, Pap. Mich. Acad. Sci. 1: 117 (1921)

Description author: Johannes Harnisch (Request Authorship Credit)
Description editors: Nathan Wilson, walt sturgeon