only known from one site, probably D
This mycorrhizal species is restricted to a small area of one valley in the Talamanca Mountains of Costa Rica. It has been found repeatedly at this site. It has not been seen in any other site despite nearly 20 years of intensive survey work throughout Costa Rica plus surveys in northern Panama and Guatemala.
Preliminary red-list assessment: CR D (Critically Endangered)
Only criteria D appropriate, impossible to state anything about trends based on observations from a single spot.
This assessment is based on the assumption that this fungus only exists at this single spot. If a second spot is discovered, the category will be EN (Endangered).
Restricted to small area along roadside above San Gerardo de Dota, Costa Rica at 2500 m alt. Under Quercus.
Known from 2-3 genets—so estimated number of mature individuals is 10-15.
Population Trend: Stable
Montane wet forest dominated by Quercus with an understory of palms, chusquea, etc. 2500 meters alt.
Very small population size. Only found growing near gravel road that is occasionally graded and thus susceptible to disturbance.
Protection of site
Halling, R. E. and G. M. Mueller. 1999. New boletes from Costa Rica. Mycologia 91: 893-899.
Retiboletus flavoniger (Halling, G.M. Muell. & L.D. Gómez) Manfr. Binder & Halling, in Binder & Bresinsky, Feddes Repert. 113(1-2): 37 (2002)