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Submitted URL: http://www.nybg.org//bsci//res//hall//flavongr.html
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Submission: On July 25 via api from US — Scanned from DE
Effective URL: https://www.nybg.org/bsci/res/hall/flavongr.html
Submission: On July 25 via api from US — Scanned from DE
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Retiboletus flavoniger (Halling, Mueller & Gómez) Manfr. Binder & Halling Photographs by R. E. Halling ©, 1996 We have collected this bolete from only one site, and only in a very limited area, near San Gerardo de Dota. The taxon appears allied with Retiboletus retipes and R. ornatipes, but has a black pileus and black pigment in the lower part of the stipe, a hymenophore and context that stains orange brown, and extremely bitter taste. One's fingers are stained yellow to orange from handling specimens of this species. These taxa produce a unique group of butenolide compounds called retipolides that are responsible for the bitter taste and the intense yellow color of the context (M. Gill, Natural Products Reports. 1996, p. 514-515).