• Proposed
  • 2Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
  • 5Published

Caloboletus rubripes (Thiers) Vizzini

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Scientific name
Caloboletus rubripes
(Thiers) Vizzini
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Proposed by
Noah Siegel
Comments etc.
Noah Siegel

Assessment Notes

Taxonomic notes

Described as Boletus rubripes, from California, USA (Thiers 1965), later transferred into the genus Caloboletus (Vizzini 2014).

Why suggested for a Global Red List Assessment?

Caloboletus rubripes is a common bolete in the western United States of America, in both coastal and montane forests.

Population is widespread, and no decline has been observed. We recommend it should be listed as Least Concern (LC).

Geographic range

Occurring in conifer forests in coastal northern California, and most of the mountain ranges, north through the Pacific Northwest, into southern British Colombia, Canada, east into the Rocky Mountains in Idaho and Montana, south to the ‘sky islands’ in Arizona and New Mexico.

Population and Trends

This species is common in conifer forests across much of its range; population is widespread, and no sign of decline have been noted.

Population Trend: Stable

Habitat and Ecology

Ectomycorrhizal with conifers, especially true firs (Abies spp.) in both coastal and montane forests across much of western United States. Fruiting in fall and spring.


Due to the widespread area and varied habitats this species occupies, no major threats are affecting the population overall.

Conservation Actions

No specific conservation action is needed with regards to this species.

Research needed

No specific research is needed with regards to this species.

Use and Trade

None known.


Siegel, N. and Schwarz, C. 2016. Mushrooms of the Redwood Coast. Ten Speed Press: Berkeley, CA. 601 p.

Thiers, H.D. 1965. California Boletes. I. Mycologia 57(4): 524-534.

Vizzini, A. 2014. Nomenclatural novelties. Index Fungorum no. 146: 1-2.

Wood, M.G. and Stevens, F.A. 2020. MykoWeb; California Fungi. https://www.mykoweb.com/CAF/species/Caloboletus_rubripes.html

Country occurrence

Regional Population and Trends

Country Trend Redlisted