Collection location: Somerset Co., New Jersey, USA [Click for map]
I’ve been finding these diminutive brown boletes with brilliant golden yellow pore surfaces all over NJ from late June. In the past I would have called them B. innixus, but now I am not so sure. They like to grow in small groups (not caespitose) on mossy banks under oaks.
The spore print is brown. The spores are mostly subfusiform, a few were cylindrical; greenish in KOH, stuffed with “broken glass”. The spores range is 9.3-11.2 × 4.2-5.1 microns (8/1/1). The average size is 10.2 × 4.7 um.
NH4OH produced an orangish-brown stain on cap cuticle; no green flash associated with B. innixus was observed.
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sum(score * weight) /
(total weight + 1)