Observation 287918: Boletus atkinsonii Peck

When: 2017-07-31

Collection location: Plymouth Twp., Luzerne Co., Pennsylvania, USA [Click for map]

Who: Phil Yeager (gunchky)

No specimen available

Near Oak and Maple.
Cap 10-12.5 cm diameter; flesh white; pores white becoming yellowish and staining brown. tubes 5-12 mm long. Stipe 7 cm long x 2.5 cm at apex, solid, tapered to base with white mycelium.
NH4OH seemed to produce a brownish or brown-orange reaction on the cuticle and stipe.
FeSO4 was either brownish orange or no reaction. This chemical could have just cleaned the cap surface. Not sure.


Proposed Names

29% (1)
Recognized by sight
57% (1)
Used references: Igor and BRB

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

= Observer’s choice
= Current consensus


Add Comment
Thanks Scott and Igor
By: Phil Yeager (gunchky)
2017-08-23 17:53:18 PDT (-0700)

I checked BRB and B. atkinsonii seems to match well with my notes. I’ll give it a shot.

Seeing is believing
By: I. G. Safonov (IGSafonov)
2017-08-23 15:56:09 PDT (-0700)

If you zoom into the thumbnail pic, you will clearly see reticulation from the apex down to at least the middle of the stipe. This trait alone eliminates porphyrosporus and eximius from consideration, not to mention that 287918 has green tubes. These two features are consistent with Boletus sensu stricto. I am thinking B. atkinsonii, which usually sports a finely cracked cap.

Have you considered…
By: Scott Pavelle (Scott Pavelle)
2017-08-23 15:22:19 PDT (-0700)

Porphyrellus porphyrosporus? The dark pore color leans in that direction and the chemical tests would sorta kinda be consistent. A less likely possibility would be Sutorius eximius. I would actually suggest them as possibilities if the critter didn’t look so very old. I fear the odd pore color comes from age rather than nature, which would throw everything into a tizzy.