Observation 30085: Boletus fibrillosus Thiers
When: 2009-12-10
No herbarium specimen
0 Sequences

Size, shape and habitat (under Bishop pine at Fisk Mill, Salt Point), density and surface of stipe and cap, all suggest B. edulis, but the color is taupe and golden-yellow, with slight cracking in the top. Haven’t been able to get a spore print yet, but no staining observed when cut or bruised [update: pores eventually turned brown where scraped]. Cap 15-17 cm (6"+) across. Pores small, approx 1mm.

Proposed Names

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ah yes, secret staining!
By: Debbie Viess (amanitarita)
2013-11-11 15:47:36 CST (-0500)

most formal descriptions say no, reality sometimes sez yes.

By: Christian (Christian Schwarz)
2013-11-11 15:43:12 CST (-0500)

most Edulis clade boletes will show brown pores when damaged, at least eventually. Here’s B. fibrillosus doing so:
observation 50920

leaning towards the yellow fibrillosus variant…
By: Debbie Viess (amanitarita)
2013-11-11 15:32:18 CST (-0500)

is that yellow context on the cap, too? At any rate, the yellow forms are much more pale than the dark brown forms, on both cap and stipe.

pores on fibrillosus shouldn’t brown when bruised.

By: Danny Newman (myxomop)
2010-11-10 19:39:15 CST (-0500)

i can’t conceive of this passing for any Suillus. Is B. fibrillosus an edulis group member, or a Boletus unto itself?

By: Christian (Christian Schwarz)
2010-11-10 10:09:19 CST (-0500)

I think the density of the pores and relative bulkiness of the cap compared to the already bulky stipe rules out S. fuscotomentosus.

Created: 2009-12-11 16:47:47 CST (-0500)
Last modified: 2013-11-12 03:27:46 CST (-0500)
Viewed: 246 times, last viewed: 2017-11-18 01:01:12 CST (-0500)
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