Observation 1637: Xerocomus subtomentosus (L.) Quél.

When: 2006-12-16

Collection location: Salt Point State Park, Sonoma Co., California, USA [Click for map]

Who: Darvin DeShazer (darv)

No specimen available

Species Lists



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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Xerocomus subtomentosus
By: Darvin DeShazer (darv)
2006-12-20 22:24:56 PST (-0800)

Good lead Nathan! After a quick trip to the compost pile with a bottle of 10% NH4OH to test for a green color I read in Xerocomus (Fungi Europaei Vol. 8) and changed the name to Xerocomus subtomentosus.

Red base?
By: Nathan Wilson (nathan)
2006-12-20 08:51:02 PST (-0800)

So looking at the key in online version ‘The Boletes of California’ the last couplet says:

23. Stipe short, often flattened at the apex, colored red in the base and yellow in the apical portion; cap reddish brown

But in the photo the one in the upper left looks like it has a white base. Personally, I’d put this collection in the X. tomentosus/X. spadiceus group.

CA Mushrooms
By: Darvin DeShazer (darv)
2006-12-19 20:52:24 PST (-0800)

I used the key in the bolete book by Harry Thiers: California Mushrooms.

Looks different from X. dryophilus
By: Nathan Wilson (nathan)
2006-12-19 20:25:23 PST (-0800)

The X. dryophilus I commonly find in southern California always has red in the stipe, especially near the bottom, and a pinched base. This looks like it has a white base and pinching. What features do you use when you apply this name?



for a typical southern California collection. And


for a common color variant.

Created: 2006-12-18 22:15:45 PST (-0800)
Last modified: 2006-12-20 22:20:21 PST (-0800)
Viewed: 64 times, last viewed: 2017-06-04 14:06:45 PDT (-0700)
Show Log