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

Boletus regineus Arora & Simonini

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Scientific name
Boletus regineus
Arora & Simonini
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Proposed by
Noah Siegel
Comments etc.
Noah Siegel

Assessment Notes

Taxonomic notes

For many years this species was identified as the European species Boletus aereus (Thiers 1975, Arora 1986, Bessette et al. 2000).

It was formally described as a distinct species, Boletus regineus, based on a California Type collection (Arora 2008).

Why suggested for a Global Red List Assessment?

Boletus regineus is a locally common bolete in hardwood forests of California and Oregon, USA.

This species is edible, and is often collected for food; no sign of decline has been noted due to picking.

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

Geographic range

Locally common in coastal and Coast Range forest throughout northern California, and the Sierra Nevada and Cascade Range foothills; rare in southern California, occurring south to at least Santa Barbara County. Scattered throughout the lower elevations in the eastern parts of the Coast Range, Willamette Valley, and Cascade Range in Oregon, and at low elevation (and often urban) areas in Washington, USA.

Population and Trends

Population is widespread in western North American, and no decline has been observed.

Population Trend: Stable

Habitat and Ecology

Ectomycorrhizal, mostly associated with hardwoods; Tanoak (Notholithocarpus densiflorus), oaks (Quercus spp), Madrone (Arbutus menziesii), Chinquapin (Chrysolepis chrysophylla), and occasionally manzanita (Arctostaphylos spp.), and more rarely with conifers. Common in coastal and coast range forest, and the Sierra Nevada foothills in California, occasional in low to mid elevation forests in western Oregon and Washington, USA.


No threats have been identified.

Conservation Actions

No specific conservation actions are needed with regards to this species.

Research needed

No specific research is needed with regards to this species.

Use and Trade

Boletus regineus is an edible species, and is widely harvested across much of its range.

Food - human


Arora, D. 1986. Mushrooms Demystified. Ten Speed Press: Berkeley, CA. 959 p.

Arora, D. 2008. California Porcini: Three New Taxa, Observations on Their Harvest, and the Tragedy of No Commons. Economic Botany 62(3): 356-375.

Bessette, A.E., Roody, W.C. and Bessette, A.R. 2000. North American Boletes: A Color Guide to the Fleshy Pored Mushrooms. Syracuse University Press: Syracuse, NY. 400 p.

Desjardin, D.E., Wood, M.G. and Stevens, F.A. 2015. California Mushrooms: The Comprehensive Identification Guide. Timber Press: Portland, OR. 560 p.

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

Thiers, H. D. 1975. California Mushrooms—A Field Guide to the Boletes. Hafner Press: New York, NY. 261 p.

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

Country occurrence

Regional Population and Trends

Country Trend Redlisted