Collection location: University of California Santa Cruz, Santa Cruz Co., California, USA [Click for map]
This comparison illustrates some of the non-microscopic field marks that I have been using to separate the two species.
Boletus truncatus usually has a relatively more robust stem with the red color concentrated towards the apex and descending in distinct scales, and a darker and less areolate-cracked pileus.
Boletus chrysenteron has a more slender appearance, with the red coloration more oriented towards the bottom of the stipe and with less prominent “red-scales-on-yellow background” appearance.
|I’d Call It That||3.0||5.88||1||(Christian Schwarz)|
sum(score * weight) /
(total weight + 1)
I fully agree with these findings in the sense of Bay Area material. In general, X. chrysenteron is a fairly gelatinous concept and I even doubt that we have the real deal exactly, except that they all look alike. In the Eastern NA it tends to be even smaller. My European collections are more similar to ours. In my experience X. truncatus is very common near Live Oak. The European X. porosporus has similarly truncated spores. I banged my head against that wall sometime ago, but decided that there are more profitable gigs than trying to id Xerocomus. The gazillion fruitbodies in Northern California and Oregon under various conifers that one can see right now look more like X. truncatus, but are not with truncated spores.D.
Would you mind actually creating a separate observation and then reusing the images? This observation would then get assigned to one of the species (keeping the appropriate micrographs) and the other would be the other. This will clarify the voting and will make these useful observations more prominent to people looking at the corresponding description pages. Thanks!
Created: 2009-11-14 22:18:27 CST (-0600)
Last modified: 2016-04-27 14:25:08 CDT (-0500)
Viewed: 92 times, last viewed: 2018-01-20 15:32:12 CST (-0600)