When: 2007-12-31

Collection location: Tomales Bay State Park, Marin Co., California, USA [Click for map]

Who: Ron Pastorino (Ronpast)

Specimen available

Also see Observation #5729. This may not be a valid ID, but the reddish pores and the variable sized spores do make for a tentative match. They could also be variations of Boletus chrysenteron or Boletus truncatus.
Rechecked spores on 7-8-2011.
Spores truncated and ~ 12.3-15.2 X 5.3-6.2 microns.


Proposed Names

32% (2)
Recognized by sight
Used references: Recent communication with Noah Siegel.
18% (2)
Based on microscopic features: Spores truncated and are in the range of Boletus truncatus
19% (3)
Recognized by sight: see Smith, A Fieldguide to Western Mushrooms (1975) due to a kind hint by Mr. Klofac
Used references: Smith (1975) as “Tylopilus amylosporus” or Porphyrellus. Later Wolfe re-named it Boletus amylosporus within sectio Truncati.
57% (1)
Recognized by sight: Strong bluing, southern distribution

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= Observer’s choice
= Current consensus


Add Comment
By: Christian (Christian Schwarz)
2011-07-08 22:43:07 CDT (-0400)

Yeah, the accumulation of fine red scabers over the stipe culminating in most red around the top of the stipe, like a ‘collar’ of pigment definitely points to Xerocomus/Boletus truncatus in my mental taxonomy.

Boletus mendocinensis not….
By: Ron Pastorino (Ronpast)
2011-07-08 20:06:37 CDT (-0400)
Decided to revisit this Observation and recheck the spores with my newer equipment. Spores were ~ 12.3-15.2 X 5.3-6.2 microns and definitely truncated. They fit the range for B. truncatus and the red tints on the pores are probably not too uncommon for this species.