Notes: Found growing on the side of the road in grass.
Cap flesh bruising blue then fading
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I enjoy doing the microscopy when I can. I like knowing that kind of info. I’ve just been so busy this year it’s been difficult getting around to my collections.
(sorry about just now responding to your comment after almost two months!.)
Thank you for doing extra work on this mysterious bolete and tabulating spore measurements in your last comment. Assuming that these are accurate, the fairly large spore size conveniently helps eliminate every species in the immediate bicolor-like cluster of about 12 species I listed in my first comment, with exception of B. miniato-olivaceus and B. miniato-pallescens, whose spores are in the 11-14 and 11-17 micron range, respectively. Unfortunately, the pore mouths of your specimen didn’t bruise blue, which is not the case with the two aforementioned boletes, not to mentioned some other non-matching macroscopic traits as per the big bolete book (B-R-B) that firmly eliminate these as viable possibilities notwithstanding the promising spore size data. Having said this, I am about to throw in a white flag on this ID, as the latest lead proved to be a dead end in terms trying to reliably match your mushroom with anything in B-R-B. Who knows, maybe it’s a new species. :-) Nevertheless, it’s been fun trying to solve this challenging puzzle, and I would like to thank you again for providing key information for this effort.
I measured 10 spores.
13.8 × 5.2
12.7 × 5.8
12.1 × 4.6
13.2 × 5.2
13.8 × 5.2
13.8 × 5.8
12.7 × 4.6
14.4 × 5.8
13.2 × 5.2
12.7 × 5.2
I.G., the spore print was a tan color with maybe some olive hues.
(As I’ve mentioned before I’m terrible with colors.)
Thanks for the info. I am rather suprised that only the cap context turned blue, and looking at your photos the bluing was rather weak. If the spores dropped, I would presume they are mature and of a size appropriate for measurement. Out of curiosity, what color was the spore print?
Still, based on all the information in hand, I am afraid that the identity of this bolete will continue to remain a mystery. To facilitate your bolete identification in the future, when macroscopic observations prevent you from getting to the actual species, I suggest testing your specimens with aqueous solutions of potassium hydroxide (3-5% w/w), ammonia (13-15%) and iron(II) sulfate (10% w/w). Being a chemist myself, I believe qualitative macrochemical tests to be quite reliable in basidiocarps of all ages…
The pore mouths did not bruise blue nor did the context of the stipe. Only the cap flesh bruised blue.
I was surprised that I actually got a spore print out of this guy. Even though I have a spore drop, will those spores be immature and undersized?
I did however have to throw out the specimen yesterday after I realized that it was being colonized by a mold of some sort.
I still have the spore print though.
This looks like a young specimen, so its spore will likely be immature and undersized, but still every bit of information you provide helps. By the way, did the pore mouths bruise blue as well? Also, it can be inferred from your description that stipal context did not blue at all — is it so?
I can take a look at the spores and measure a few if that will help anything, but I can’t promise that it’ll will be soon.
Funny thing: every time somebody post a bolete like the one pictured here — red or red-brown cap, yellow stipe with some red here and there, yellow tubes, some blue-staining action on surface and/or flesh — you know what I am talking about — the MO gets unusually reticent. Few people seem to be interested in proposing a name and starting a discussion, unless it is surely the usual suspects, like B. sensibilis/pseudosensibilis/bicolor…
I know this is a big stretch and I’m very likely (99.9%) to be wrong, but the tri-color “palette” of the pileal context might suggest Boletus patrioticus. I am not familiar with the species at all, and the only example of it posted on MO by Walter Sturgeon looks nothing like this one. Judging from the pics, this young basidiocarp of an unusually robust and stout stature is likely to belong to the “bicolor” cluster that includes, in addition to the aforementioned trio, B. bicoloriodes, rufomaculatus, miniato-olivaceus, miniato-olivaceous, miniato-pallescens, palidoroseus, patrioticus, carminipes, subfraternus, et al., whose names I cannot even mention :-). Take your pick or start eliminating names!
Created: 2011-07-22 10:05:08 MST (-0700)
Last modified: 2011-08-05 18:56:14 MST (-0700)
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