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

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Xerocomus subtomentosus
By: Darvin DeShazer (darv)
2006-12-21 15:24:56 JST (+0900)

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)
2006-12-21 01:51:02 JST (+0900)

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)
2006-12-20 13:52:24 JST (+0900)

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

Looks different from X. dryophilus
By: Nathan Wilson (nathan)
2006-12-20 13:25:23 JST (+0900)

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: 2006-12-19 15:15:45 JST (+0900)
Last modified: 2006-12-21 15:20:21 JST (+0900)
Viewed: 64 times, last viewed: 2017-06-05 06:06:45 JST (+0900)
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