Please do not re-click a link while waiting for a page to load. (It’s slower and degrades site speed for all users.)
To get images for machine learning, see MO Images for Machine Learning


When: 2008-09-24

Collection location: Madison Heights, Pasadena, California, USA [Click for map]

Who: Jason Hollinger (jason)

Specimen available

Here’s another set of these darned mushrooms which I’ve probably incorrectly been calling Boletus subtomentosus. Cap is NH~4~ negative; flesh doesn’t bruise, tubes bruise dingy brownish. This one has particularly bright yellow mycelial fuzz at the base of its stipe, which is new. The amount of red on the stipes is quite variable: these show quite a bit; others are pure yellow. These are also among the smallest I’ve seen, being only between 3 and 4 cm wide. Spore print is yellowish-brown. Found under young Quercus agrifolia.


Proposed Names

3% (2)
Recognized by sight
57% (1)
Recognized by sight

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
red stipe must be so. cal. thing…
By: Jason Hollinger (jason)
2008-09-26 14:24:14 CDT (-0400)

Almost all of the ones I see down here have at least some red on their stipes. I suppose I should find at least one other difference from B. subtomentosus before I declare this a new species or even variety! :)

Yellow mycelium matches
By: Douglas Smith (douglas)
2008-09-26 10:28:26 CDT (-0400)

These usually have yellow mycelium at the base, but I don’t think I’ve seen the red in the stipe.