When: 2009-09-23

Collection location: Big Thicket National Preserve, Polk Co., Texas, USA [Click for map]

Who: Ron Pastorino (Ronpast)

No specimen available

The outstanding characteristic of this specimen was the rapid, bright blue bruising of the pores, flesh, and stipe. The average size of the spores was about 15.1 X 5.4 microns so that seems to include B. pulverulentus. I left some room to be overruled since the cap color seems much lighter than noted in the descriptions.

Species Lists


Proposed Names

-18% (3)
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
Yes, I.G., one could make a case
By: Ron Pastorino (Ronpast)
2009-10-11 19:33:32 CDT (-0400)

for Boletus oliveisporus also (nice photo on your Observation). The cap color is still a problem for both, however. One of the reasons I selected B. pulverulentus is that B-R-B mentions that this species blue stained pores turn brown eventually, which I did note.
Also, I checked an old species list compilation from the Texas Mycological Society that covered about 16 years. It mentions B. pulverulentus but not B. oliveisporus. That might be worth an upgrading to “Promising”!?!

You may also want
By: I. G. Safonov (IGSafonov)
2009-10-11 16:35:11 CDT (-0400)

to consider Boletus oliveisporus as a possible match. Unlike B. pulverulentus, it is reported to fruit in Texas, according to B-R-B that is. Check out my observation for B. oliveisporus (25138).