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

Rubroboletus eastwoodiae (Murrill) D. Arora, C.F. Schwarz & J.L. Frank

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Scientific name
Rubroboletus eastwoodiae
(Murrill) D. Arora, C.F. Schwarz & J.L. Frank
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Proposed by
Noah Siegel
Comments etc.
Noah Siegel

Assessment Notes

Taxonomic notes

This species was described as Suillellus eastwoodiae from a collection made by Alice Eastwood from the San Francisco Bay Area (Murrill 1910); it was soon after transferred to the genus Boletus (Saccardo & Trotter 1912).

For many years, the California species was called Boletus satanas (an European species now in the genus Rubroboletus) and “Boletus” eastwoodiae was misapplied to what is now known as Rubroboletus pulcherrimus (Siegel et al. 2019, Thiers & Halling 1976, Wood & Stevens 2020).

The Californian Boletus eastwoodiae was shown to be distinct from the European B. satanus, and was transferred into the genus Rubroboletus (Frank 2015, Tibpromma, S., Hyde, K.D. & et al. 2017).

Why suggested for a Global Red List Assessment?

Rubroboletus eastwoodiae is a common bolete in California, USA. Most populations come from the range of its preferred ectomycorrhizal partner, Coast Live Oak. Also occasionally with other oak species around the Central Valley in California, and scattered populations in the Willamette Valley of Oregon, and Columbia River valley in southern Washington.
Population is widespread, and no decline has been observed. We recommend it should be listed as Least Concern (LC).

Geographic range

Common in the range of Coast Live Oak (Quercus agrifolia); occurring from southern California, USA into Mendocino County in coastal/Coast range forests; also scattered populations inland around the Central Valley of California, and more rarely with Quercus garryana in the Willamette Valley of Oregon, and Columbia River valley into Washington.

Population and Trends

Population is widespread, and shows no sign of decline.

Population Trend: Stable

Habitat and Ecology

Ectomycorrhizal with oaks (Quercus spp.), especially Coast Live Oak (Quercus agrifolia). Typically in stands of oak with thick duff, or duff buildup, without a grassy or weedy under story. Fruiting in fall.


Urban development leading to loss of habitat. Invasive plants, especially grasses growing in oak woodlands.

Conservation Actions

Control invasive plants in oak woodlands.

Research needed

Use and Trade

This species is toxic.


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

Frank, J.L. 2015. Nomenclatural novelties. Index Fungorum no. 248: 1.

Murrill, W.A. 1910. North American Flora 9(3): 133-200. (Protologue)

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

Saccardo, P.A. and Trotter, A. 1912. Supplementum Universale, Pars VIII. Sylloge Fungorum. 21:1-928

Tibpromma, S., Hyde, K.D. et al. 2017. Fungal diversity notes 491–602: taxonomic and phylogenetic contributions to fungal taxa. Fungal Diversity 83(1): 1-261.

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

Country occurrence

Regional Population and Trends

Country Trend Redlisted