Observation 242905: Boletus atkinsonii Peck

Caps up to 12.0 cm across.
Flesh white and unchanging.
Stipe with some reticulation near apex.
Taste mild.
Spore print olive brown.
Spores ~ 11.0-14.6 X 4.0-5.3 microns, fusoid, and smooth.
Q(avg) = 2.61.
Found in the same park, different day and different area as B. atkinsonii(MO#242864).

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Thanks Igor,
By: Ron Pastorino (Ronpast)
2018-02-12 18:01:31 PST (-0800)

I’ll have to dig this one out of my “herbarium” to see what kind of shape it is in.
Weather cooperating, I do plan another “expedition” to the area later this year.

By: I. G. Safonov (IGSafonov)
2018-02-11 21:45:37 PST (-0800)

Glad you revisited this obsie. I hope this one finds its way to Dr. Dentinger, just like all the other interesting porcini types you collected in the Gulf area…
Regarding B. akinsonii… Not sure about the distribution of this species, let alone those of many other poorly known porcinis endemic to this country for that matter, without doing at least a preliminary genetic survey of samples. For instance, there are some indications that Boletus variipes (likely conspecific with B. variipes var. fagicola) is a “northerner”, but there is at least one genetically distinct relative or a species cluster that is very common in the south (see discussion in obs 282673).
Some northern boletes (not necessarily the porcinis) have effortlessly followed their host trees into the subtropical belt (I heard a great lecture on this topic by Dr. Roy Halling a few years ago), while other ones remained restricted to the temperate zone. Similarly, a number of adventurous “southerners” crept up along the Atlantic coastal plains as far as NJ and Long Island, NY, and feel at home there. Obviously, this up and down migration is true of many mycorrhizal fungi, not just boletes…
Peck collected atkinsonii in NY. I have a gut feeling it prefers to stay north of the Mason-Dixon line, but I wouldn’t bet much on this hunch for your 242864 looks like a reasonable match to the current B. atkinsonii concept! It would be nice if you could get your hands on this intriguing critter again and preserve a voucher this time… If you are planning another expedition to the Gulf area this season, I wish you good luck! :-)

Yes, now I really regret not saving the other
By: Ron Pastorino (Ronpast)
2016-06-29 20:47:09 PDT (-0700)

The spores on these definitely seemed olive brown(as indicated from the pores). The caps on these appeared to be minimally rimose and the stipe reticulation much less. But the overall look is similar.
At least I have these in hand.

By: I. G. Safonov (IGSafonov)
2016-06-29 20:26:38 PDT (-0700)

Some boletes you got there, Ron. :-) Even before reading your notes I immediately thought of obs 242864. They don’t look quite the same, yet there is some semblance between the two collections, including the spore size. Well, maybe there are the same thing after all… It would be nice to sequence these eventually.

Created: 2016-06-29 20:04:21 PDT (-0700)
Last modified: 2018-02-13 13:43:26 PST (-0800)
Viewed: 127 times, last viewed: 2018-02-15 07:59:33 PST (-0800)
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