Observation 217313: Boletales E.-J. Gilbert
When: 2015-09-29
No herbarium specimen

Notes: A pair of specimens were growing in pine duff around trunk of mostly cut-down grey pine tree. Extensive mycelium recovered in both.

Pileus buff color, dry, smooth w/some shallow fissures ~ 11 cm x 11 cm. Second specimen was larger: pileus 14 cm. Tubes, ~0.5 cm length, looked yellow but brown surface mostly…can’t distinguish dirt vs. age. Pileux context yellow cream blueing instantly on cutting, but not proceeding very extensively, ie limited blueing but fast.

Stipe yellow cream color, slightly reddish toward base, 5 cm long, 2-4 cm diameter and curved, widest in middle, narrowing toward base.

Taste was mild, unoffensive, and not peppery or acrid.

Macrochemical tests: Ammonia caused no reaction on pileus surface or context. 4% KOH caused slow formation of light/medium brown color on pileus surface and changed pileus context from yellow cream to mustard yellow.

Welcome input on identity!


Found in pine duff, so extensive mycelium came up intact with bolete. Pileus surface looks more tan than reality; see last photo.
Pore surface brown toward center, more yellowish toward periphery. Can’t tell if brown is dirt or consequence of aging etc.
Pileus context and stipe stained blue instantly when cut, but limited in extent as shown.
Pileus surface stained light brown/brown with 4% KOH (left and right spots) and essentially not at all with ammonia (top, middle)
This is a second specimen of same species that was larger (14 cm across widest part of pileus), and this photo in natural light shows better the true color of main specimen’s surface: buff, yellowish in fissures

Proposed Names

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Created: 2015-09-30 14:20:20 CDT (-0400)
Last modified: 2015-09-30 14:20:27 CDT (-0400)
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