Notes:
These were found at the NJMA foray at Stokes S.F. by unknown participants.
The two fbs apparently represent separate collections as they were displayed separately.
The general habitat is hemlock-dominated woods with broadleaf trees (birch, maple and oak) intermixing.
Pale bluing of the pores and of the flesh just above the tubes has been observed. The young fb has been preserved.

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YES
By: Robert(the 3 foragers) (the3foragers)
2018-07-04 09:03:11 MDT (-0600)

I am not ruling out mini-o at all. Most of the characteristics point that way anyway.
For me the pointy base The stipe ornamentation and color. and Yellow mycelium is important for good ID. However it would be nice to see the cross section photo as well.

Re yellow pore mouths turning red
By: I. G. Safonov (IGSafonov)
2018-07-03 21:19:20 MDT (-0600)

I think this can sometimes happen (weather/environmental conditions?), but it would not necessarily indicate a reliable identification trait on one hand or should be used to weaken or even reject a proposal on the other. For example, this young Butyriboletus brunneus also has red pores: obs 76870.

What else would you have checked for Robert?
By: Scott Pavelle (Scott Pavelle)
2018-07-03 21:00:08 MDT (-0600)

I’m sure mini-o would have been one of your “possibles” list. What would have been the others? And what are your “tells” for the species? Dave provided his in another obsie.

Strange
By: Robert(the 3 foragers) (the3foragers)
2018-07-03 20:53:10 MDT (-0600)

I see mini o here in CT. Every year but I have never seen it with such a red pore.

Scott,
By: I. G. Safonov (IGSafonov)
2018-07-03 18:59:18 MDT (-0600)

My experience with B. miniato-olivaceus is fairly limited so far, as I have have seen it in the flesh only an handful of times, while having never collected it personally, and posted it only twice on MO (1st post = obs 168189 from 2014). As a matter of fact, when I came across this collection (280028) last year, I was first stumped by it for a while till I somehow recalled my 2014 encounter.
However, it’s perhaps one of the easier boletes to ID, especially if one keeps reminding himself of its apparent connection with Tsuga canadensis and thus of predominantly, if not exclusively, northeastern distribution (I bet it’s not found in FL as some field guides say). Some earlier references give preference to purely deciduous woods, but those records are likely in error either due to misidentification or failure to properly observe the habitat, and the currently accumulated evidence on MO points toward hemlock as the symbiont. It’s also an early summer bolete, frequently arriving at the scene in June thru mid-July, though a number of MO observations also date from Aug and even Sept.
The vermilion to rose-red cap, fading to dull pink and showing olive-yellow colors in age, rich-yellow pores tinged with green and sometimes reddening in age [Snell & Dick (1970), NAB (2000), BENA (2016)], pale yellow stipe flushed here and there with pink to pale red streakiness and whitish to pale yellow flesh that usually blues slowly and weakly or sometimes almost not at all summarize its unique gestalt. Snell & Dick also mention the occasional disagreeable odor, and indeed this collection really reeked (a disgusting cheesy-fishy odor that I failed to record in my notes) both when fresh and when dried, as I was reminded recently when I sent a portion of this material to AF in FL.
“Mini-o” is one of the oldest NA bolete taxa, having been described by Frost in 1874, but, as Roy E. Halling (1983) points out, its species concept seems to have been established firmly only when Smith & Thiers took a closer look at Frost’s 1863 collection from Brattleboro, VT, in 1971. Regarding this, read REH’s commentary in his Boletes described by Charles C. Frost – published in Mycologia 75, 70-92 (1983) – that I uploaded in two images to this observation (presumably no copyright infringement as the article comes straight from CYBERLIBER online and is reproduced here for teaching purposes only).
Smith & Thiers thoroughly studied Frost’s “mini-o” collection housed at NYS in Albany microscopically and designated that material as lectotype. Their observations as well as Frost’s original description of “mini-o” can be found here: https://quod.lib.umich.edu/....

The pores get this red on mini-o?
By: Scott Pavelle (Scott Pavelle)
2018-07-03 15:28:28 MDT (-0600)

I know they add red with age, but this critter looks young and that is a lot of age! The stipe is dead on, and the cap color consistent, but what are the other features that lead you to this ID?

I just got done telling Dave how much this species frustrates me. I can’t ever seem to get a species concept that would let me rule the close calls in or out.

Created: 2017-06-26 14:06:16 MDT (-0600)
Last modified: 2018-07-13 18:43:44 MDT (-0600)
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