Identifying Your Bolete
8.5
YELLOW-CRACKED BOLETE
Boletus subtomentosus, Xerocomus subtomentosus
Frequency
Infrequent
Habitat Area
Under broadleaf trees or mixed woods, among mosses.
Cap
Olive-green becoming olive-brown in age, often rimose at maturity.
Margin
Even with a narrow band of sterile tissue.
Tubes
Adnate, depressed near the stalk.
Pores and Pore Surface
Yellow when young, becoming yellowish olive in age, immutable or staining greenish blue when bruised; pores large and angular, 1-2 per mm.
Stalk
Nearly equal or enlarging at the apex.
Stalk Feature
Stipe marked with ribbed lines, especially near the apex, but not reticulate, with reddish brown to cinnamon dotts on a yellowish or brownish red background.
Flesh
Yellowish white in the cap to ivory in the stipe, immutable, sometimes bluing slightly when cut.
Basal Mycelium
Yellowish.
Chemical reactions
Yellowish.
FLESH: Towards beige with KOH and NaOH; to gray with FeSO4 and formalin; towards brown with phenol; no change with NH4OH.
CAP-STIPE: towards beige with KOH and NaOH; to gray with FeSO4 and phenol; no change with NH4OH and formalin.
No reaction initially with NH4OH on the cap, but after 20 to 30 minutes the color of the cap changes to reddish orange.
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