Observation 50498: Boletus zelleri Murrill

When: 2010-08-12

Collection location: Point Reyes National Seashore, Marin Co., California, USA [Click for map]

Who: Adam Singer (adam)

No specimen available

Cap is a dark, purplish brown, some aereolate (cracks) on the cap, it is over all kind of smooth, but textured or a little roughened… as MD says “with a finely powdered appearance.” Spores were yellow when fresh, kind of yellow-green-brown as they aged. Neither spores nor flesh seemed to stain though next day noticed some mild darkening. Stalk is yellow, pure yellow at the top w/ red looking dots or scruffyness or as MD calls them “granules” on the bottom 1/2 – 2/3d’s of the stalk. The spore print was olive looking from a distance, dark brown close up.

At first I thought it was a suillus (may still be as mine do not match the photos I saw on mykoweb)
Keyed out in MD p. 513 8 – 15 – 16 – 17 – 27 – 38 – 39 – 40 – 41 lead me to a fork between sub-tomentosus and chrysenteron & others but that says sub-tomentosus “stem never red…” and chrysenteron has a very cracked cap. However in the others section, I read up on B. zelleri and seemed a good match. B. citrinporus looked possible but that too never has a red stalk.

So is it a zelleri?

Sorry for the poor photo quality, promise to have better photos next time.

Species Lists


Copyright © 2010 Adam S.
Copyright © 2010 Adam S.
Copyright © 2010 Adam S.
Copyright © 2010 Adam S.

Proposed Names

39% (4)
Used references: Mushrooms Demystified

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Looks like it to me
By: Sam Longmire (longmires4)
2010-08-16 23:47:25 CDT (-0500)

The season, relative abundance and individual variability of B. zelleri in CA are factors in favor of it being B. zelleri, as well as the visible characteristics and overall gestalt.

Created: 2010-08-16 21:03:23 CDT (-0500)
Last modified: 2010-08-18 03:53:20 CDT (-0500)
Viewed: 77 times, last viewed: 2018-01-19 14:36:28 CST (-0600)
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