• Proposed
  • Under Assessment
  • CRPreliminary Assessed
  • 4Assessed
  • 5Published

Retiboletus flavoniger (Halling, G.M. Muell. & L.D. Gómez) Manfr. Binder & Halling

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Scientific name
Retiboletus flavoniger
(Halling, G.M. Muell. & L.D. Gómez) Manfr. Binder & Halling
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Preliminary Assessed
Preliminary Category
Proposed by
Gregory Mueller
Gregory Mueller
Comments etc.
Anders Dahlberg, Michael Krikorev

Assessment Notes

only known from one site, probably D

Taxonomic notes

Why suggested for a Global Red List Assessment?

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).

Geographic range

Restricted to small area along roadside above San Gerardo de Dota, Costa Rica at 2500 m alt. Under Quercus.

Population and Trends

Known from 2-3 genets—so estimated number of mature individuals is 10-15.

Population Trend: Stable

Habitat and Ecology

Montane wet forest dominated by Quercus with an understory of palms, chusquea, etc. 2500 meters alt.

Subtropical/Tropical Moist Montane Forest


Very small population size. Only found growing near gravel road that is occasionally graded and thus susceptible to disturbance.

Roads & railroadsOther threat

Conservation Actions

Protection of site

Site/area protection

Research needed

Use and Trade


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)

Known distribution - countries

Regional Population and Trends

Country Trend Redlisted