Observation 993: Boletus subtomentosus L.
When: 2006-11-18
No herbarium specimen

Notes: Ok, spoke too soon on this one. Thought it was a flaviporus from the bright yellow pores. But the cap is too dark a brown, and most important — it is not visid. Darn, haven’t found one in a year, and the details are slipping in my mind. The visid cap is the important feature of the flaviporus. This is a young subtomentosus, where the pores haven’t opened up enough yet, and obviously is more yellow when young. But looking at other photos of mine, not as yellow as the flaviporus.

Proposed Names

57% (1)
Eye3 Eyes3
Recognized by sight
10% (2)
Recognized by sight: Brilliant yellow pores without strongly ridged descending reticulum, dark cap

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Not sure I agree…
By: Douglas Smith (douglas)
2010-11-25 07:18:46 CST (-0500)

You might be right that these photos suggest an id of B. citriniporus, but I’m not sure I can agree with that. This is part of the study of the one small area, where B. subtomentosus is seen very commonly, but there hasn’t been many id’s of B. citriniporus from that area. I should go through all the B. subtomentosus id’s maybe and see if there is enough that can be separated out, and the possibility of B. citriniporus seen from up there. But just one possible id out of the number of obs. from the area, seems to argue against it. Although it is true, this one doesn’t show the yellow mycelium on the base that is very common from the other B. subtomentosus obs., but not sure it is clear enough.

By: Christian (Christian Schwarz)
2010-11-23 15:46:56 CST (-0500)

I think B. subtomentosus (besides having a paler, duller olive-brown cap) more often shows cracks on the cap and often has a paler stem. All of these are individually weak field marks, but fairly suggestive in combination.

Here’s a photos that show’s the strong descending reticulum pretty well:


Created: 2006-11-20 00:11:15 CST (-0500)
Last modified: 2010-11-25 07:12:05 CST (-0500)
Viewed: 93 times, last viewed: 2016-10-23 03:52:22 CDT (-0400)
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