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Observation 99962: Boletus L.

When: 2012-06-29

Collection location: Mosure Rd., Gallatin Co., Montana, USA [Click for map]

Who: Edward Barge (landsnorkler)

Specimen available

Cap: 5-16 cm wide, surface smooth, dry, cracking deeply in dry weather; flesh white, patchily staining yellowish or pink (the small specimen showed faint bluing near the pileus margin after being in the refrigerator for several days); odor mild, taste mild to slightly sweet.

Pore surface: white when young, becoming yellowish olive-green in age, sometimes staining yellow to brown when bruised; 2-3 pores per mm, tubes to around 15 mm deep.

Stipe: 5-13 cm long by 4.5-7 cm wide, ventricose to clavate, white to yellowish to pinkish-brown and reticulate near apex, becoming smooth and predominately whitish toward base, surface sometimes cracking and sometimes staining light brown to yellowish where bruised.

Spores: 16-19 (av. = 17.75) x 5-7 (av. = 6) um, Q around 2.96, smooth, fusiform.

Habitat: Scattered under mature Pinus contorta.

Was thinking B. barrowsii but the spores are quite a bit larger than reported for that species.


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Add Comment
Looks hypomycetized to me.
By: Chris May (ccmaymd)
2018-12-16 06:45:06 CST (-0500)

You sure these aren’t ordinary Boletus edulis king boletes infected with Hypomyces chrysospermus? That would explain the white cap.