Observation 339363: Boletaceae Chevall.

Growing on the ground with pines most likely host.
Caps up to 9.5 cm across and somewhat tacky.
Flesh creamy bruising blue rapidly.
Spore print olive brown.
Spores~ 9.1-12.0 X 4.1-5.2 microns and smooth.
Q(range ) = 1.94-2.44
Q(Avg) = 2.23 n=14.
KOH on cap sl yellow
KOH on flesh was pinkish.
Looks a little like MO#338828 although pore color and spores somewhat different.


Proposed Names

31% (2)
Recognized by sight
28% (1)
Recognized by sight: …but spores are too small

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
They do look very much the same…
By: I. G. Safonov (IGSafonov)
2018-10-16 14:48:44 AEDT (+1100)

…including their tendency to form caespotose clusters and siamese twins, and practically identical spore measurements! As a matter of fact, when looking at this obsie I instinctively thought you reposted 338828 with additional pix. BUT, for starters, the spore contents of the two collections appear very different, and this fact alone mars the otherwise seemingly open-and-shut case of conspecificity…
When I looked at 338828 a couple of days ago, my first impression was of an old “X”. sclerotiorum. That provisionally named species (likely assignable to Pulchroboletus) has a variable appearance, as demonstrated by a number of sequenced collections posted to MO, not to mention the existence of a genetically discreet lookalike that so far has only been reported from VA, NJ and NY. However, to my knowledge sclerotiorum is not known for its predilection to grow in clusters or to produce fused twins. Smaller spores, vivid cap colors and the absence of a yellow cap margin also point away from sclerotiorum for 338828…
Well, for now Boletaceae it is… for both of them!

Created: 2018-10-16 13:49:49 AEDT (+1100)
Last modified: 2018-10-16 15:07:27 AEDT (+1100)
Viewed: 32 times, last viewed: 2019-04-19 04:13:00 AEST (+1000)
Show Log