Observation 245002: Boletaceae Chevall.

Notes:
The pore surfaces seemed less brown that I’d usually expect with vermiculosoides; reddish brown on the youngest one and orangish on the older ones.

Stipe on youngest specimen (in the best condition) whitish to pale yellow, tomentum bruising very dark blue to blackish.

Caps yellow to pale orangish tan.

Whitish context in cap staining blue, with blue stain extending into upper stipe context. Lower stipe context either reddish to begin or staining reddish upon cutting (not sure which).

Ammonia: yellowish on cap/ stipe surface, dark muddy orange on pores.

KOH: scarlet-red on cap surface and pores, yellowish orange on stipe surface, pale orange on cap context (not seen in photo).

Spores 9.5-12 × 3.5-4.

Oak woods along ridge-top, presumably acidic environment.

Preserved young and mature specimens, with badly damaged material trimmed away.

Images

All growing together in one square yard area.
young specimen
young specimen
mature specimen
mature specimen
mature specimen
Ammonia: top row mature, bottom row young, from the left… cap surface, pores, stipe surface.
KOH: top row mature, bottom row young, from the left… cap surface, pores, stipe surface.

Proposed Names

42% (4)
Recognized by sight
Used references: NAB/BRB
87% (1)
Recognized by sight

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= Observer’s choice
= Current consensus

Comments

Add Comment
By: I. G. Safonov (IGSafonov)
2016-09-08 11:15:19 CDT (-0500)

IMO, neither the color of the pore surface at any stage of development, nor the color of the pellicle at maturity, nor the red tones on and inside the stipe, nor the chemical tests reported in NAB/BRB and the original description by Smith & Thiers in The Boletes of Michigan support this proposal.

Pore surface…
By: Dave W (Dave W)
2016-07-21 23:17:17 CDT (-0500)

seems to be too dark (presence of brown) for discolor, at least as per NAB/BRB. But, Bolete Filter shows examples of discolor with dark pore surface quite like what is seen here. There does appear to be a greenish component to the ammonia reaction on the cap, which NAB/BRB reports for discolor.

I think the biggest problem for the discolor proposal is the reddish color seen in the context of the lower portions of the stipes.

Two specimens preserved.