When: 2008-11-22

Collection location: Tomales Bay State Park, Marin Co., California, USA [Click for map]

Who: Debbie Viess (amanitarita)

Specimen available

…a short term kitchen herbarium collection, that is…


close-up of reticulation shows their spiky texture from cystidia, as well as eggs of future boletivores (cruelly destroyed by bigger, badder boletivores).

Proposed Names

8% (4)
Recognized by sight: note white frosting to young cap and reticulation on apex of stipe.
82% (5)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
the preponderance of weighty ID evidence is leaning towards barrowsii…
By: Debbie Viess (amanitarita)
2009-01-12 09:24:18 CST (-0600)

both Darv and Arora vote barrowsii; obvious barrowsii fruit bodies have been collected this year in the same location; although the single fruit body was somewhat ambiguous, I am (finally) convinced that barrowsii is the best call.

By: Erin Page Blanchard (CureCat)
2008-12-17 14:14:58 CST (-0600)
By: Erin Page Blanchard (CureCat)
2008-12-17 13:51:33 CST (-0600)

I doubt B. regineus, the pileus just doesn’t look nearly dark enough.

B. barowsii is a good idea, it appears pale enough, at least from the photos.

My instinct (whatever that is) tells me this is B. edulis var. grandedulis, as I have collected many which are unusually pale, like this one. Especially, as noted, if they are partially or not emerged from the duff or ground.
The frosted cap may be a defining characteristic of B. regineus, however, it is not at all uncommon with B. edulis var. grandedulis.

I appreciate everyone’s comments on this mushroom…
By: Debbie Viess (amanitarita)
2008-12-17 11:53:53 CST (-0600)

…and this is one of the difficulties of trying to name a single, immature fruit body! David Rust (the collector) tells me that this mushroom was buried when he found it, which lends credence to Ron’s theory of it being an edulis(pigments in edulis are photosensitive). David also tells me that there WAS some pine around, as well as hardwoods (we were apparently discussing two different mushrooms and their habitats).

Arora states that cap pigment development in edulis is photosensitive; altho the cap color underneath the frosting was not white but pale brown, it was also not as dark as one would expect a regineus to be. The orange-background apical reticulations fit that species tho, as does the white cap frosting. If someone would tell me with some measure of assuredness that regineus pigments are also phototsensitive, then I would be comfy with my original ID. At this point, tho, I am harboring doubts, dammit.

Another possibility…Boletus edulis
By: Ron Pastorino (Ronpast)
2008-12-16 23:29:10 CST (-0600)
I offer another possibility…Boletus edulis var. grandedulis. See http://mushroomobserver.org/15488 . also in Tomales Bay earlier in the month, I found a whitish Bolete that initially looked like B. barrowsii, but later, after wiping off the fine white powder from the cap, it looked much more like a B. edulis. It was growing near a mixed area of pine and oak.
B. barrowsii
By: Darvin DeShazer (darv)
2008-12-16 21:37:26 CST (-0600)

Mushrooms Demystified has color photos of both species on the same page. Sure looks like the “white bolete” to me.

sticking with regineus for this ID…
By: Debbie Viess (amanitarita)
2008-12-16 11:20:28 CST (-0600)

the cap was not glabrous and white, but frosted white over a darker brown. the reticulation was typical of regineus: close, restricted to the apex, and colored apricot. The habitat was typical of regineus as well, fruiting under madrone and tanoak, manzanita and scattered incense cedar (altho barrowsii primarily prefers conifers, its only known hardwood associate is live oak).
It was also in a VERY wet environment; supposedly barrowsii likes it a bit more xeric. I can see where a mere photo ID could be mistaken for barrowsii, tho.

Nice bolete!
By: Dan Molter (shroomydan)
2008-11-23 12:46:32 CST (-0600)

The color is very pale on your big meaty specimen. Looking through the other obs here, Boletus regineus seems to have highly variable cap color.