Notes:
A single fruiting body growing in sandy soil in a grove of young white oaks. This is the same exact spot that yielded sclerotiorum of obs 73653 (August 2011), and two collections of B. bicolorobs 73634 (same date as 73653) and obs 208545 (July 2015).

Description:
> The convex cap is 5.3 cm wide and 1 cm thick in the middle from the apex to the juncture with the stipe; the pileipellis is minutely bumpy, brick red to rose-red on the disk, fading to pink toward the edge; the cap margin features a yellow sterile overhang of ~1 mm wide; the cap flesh is pale yellow, reddish just below the cuticle, bluing slightly upon exposure to air, especially just above the hymenium.
> The pore surface is yellow, bluing when injured; the pores are minute, up to 3 per mm (excluding the thickness of tube walls); the tubes are 5-6 mm long and concolorous with the pore surface, bluing upon injury.
> The S-shaped and clavate stipe is 10-11 cm long (estimated), 1.1 cm wide at the apex to 1.3 cm wide just above the base/bulb and ~2 cm across in the widest portion of the “bulb”. The yellow textured stipe surface is covered with a vertically arranged network of orange-red lines and streaks composed of scruffy pruina and punctae (bushy tufts of hyphae encrusting surface ridges under the lens); the red color is most intense in the lower 1/3 of stipe (almost no yellow ground color seen) and getting progressively lighter toward the apex, which is bright yellow and slightly ribbed/reticulated. The stipe flesh is lemon yellow, bluing at the juncture with the cap and less so in the upper half of stipe (the bottom half of stipe was not available for inspection, but given my experience with the species it was expected to blue).
> The basal mycelium is white (the beige fluff is probably a hypomyces infection).
> The spore print is olive brown.
Macrochemical Tests: KOH = a slate (gray-blue) flash, then mustard yellow on cap pellicle; muddy orange of cap flesh. NH4OH = slowly creamy-yellow on cap pellicle; darker orangish-yellow on cap flesh.
Spore Data: [20/1/1], mounted in Melzer’s and measured in side-view only (suprahilar appendage to the side);
L x W = 12.1~15.1 (-16.0) x (4.2-) 4.4~5.1 μm; L x W = 13.8 × 4.7 μm; Q = (2.5-) 2.6~3.2 (-3.25); Q = 2.92; yellowish-buff in Melzer’s, equilateral/fusiform/spindle-shaped in face-view (dorsal/ventral) and inequilateral/subfusiform in side-view (dorsi-ventral), with a well-developed suprahilar plage (i.e., the classic bolete spore shape).
Bessettes’ BENA reports (12-)14~16(-18) x 4~6 μm for sclerotiorum.

Images

Mounted in Melzer’s and viewed at x1000

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