Public Description of Boletus vermiculosoides A.H. Sm. & Thiers

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Name: Boletus vermiculosoides A.H. Sm. & Thiers
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Description status: Unreviewed

Taxonomic Classification:

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

General Description:


Cap: 4-13 cm; convex, becoming broadly convex; dry; dull; soft; finely, innately fibrillose; olive brown to medium brown or grayish brown, fading to tan; often with a yellow marginal zone, or nearly yellow overall when young—but the yellow quickly becoming brown (in some of my collections the yellow has disappeared completely only a few hours after collecting); when fresh bruising blue to black.

Pore Surface: Dark red-brown to maroon when young, but quickly fading to dull brownish orange; bruising promptly dark blue or black; pores round, 2-3 per mm; tubes dull yellowish, to about 2 cm deep.

Stem: 7-10 cm long; up to about 2 cm thick; slender; more or less equal; covered with tiny tufts of fibers that become brownish when handled; brownish overall, with a yellowish apex and, sometimes, a pale reddish zone; not reticulate; basal mycelium whitish.

Flesh: Whitish or yellowish in cap; yellowish in upper stem; staining sky blue in cap and red in stem when sliced; often becoming riddled with worms and decaying quickly.

Odor and Taste: Not distinctive.

Chemical Reactions: Ammonia reddish on cap surface; orangish on flesh. KOH dark red on cap surface; orange on flesh. Iron salts negative to greenish on cap surface; negative on flesh.

Spore Print: Olive brown.

Microscopic Features: Spores 9-12 × 3-4.5 µ; smooth; subfusiform; yellowish in KOH. Hymenial cystidia mostly fusoid-ventricose; yellow in KOH; to about 50 × 10 µ; inconspicuous. Pileipellis a densely tangled layer of repent to erect hyphae 2.5-8 µ wide; terminal elements cylindric with rounded apices. Caulocystidia utriform to fusoid-ventricose; to about 40 µ long; hyaline to golden in KOH.


widely distributed east of the Rocky Mountains.


Ecology: Mycorrhizal with oaks; growing alone, scattered, or gregariously in oak-hickory forests; summer;

Look Alikes:

Boletus vermiculosus


edible but difficult to identify


Kuo, M. (2013, December). Boletus vermiculosoides. Retrieved from the MushroomExpert.Com Web site:


Current Name:
Boletus vermiculosoides A.H. Sm. & Thiers, Boletes of Michigan (Ann Arbor): 337 (1971)

Description author: walt sturgeon (Request Authorship Credit)

Created: 2013-12-26 21:38:50 CST (-0600) by walt sturgeon (Mycowalt)
Last modified: 2013-12-26 21:38:50 CST (-0600) by walt sturgeon (Mycowalt)
Viewed: 44 times, last viewed: 2018-09-02 12:20:07 CDT (-0500)