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  • Under Assessment
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Caloboletus marshii D. Arora, C.F. Schwarz & J.L. Frank

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Scientific name
Caloboletus marshii
Author
D. Arora, C.F. Schwarz & J.L. Frank
Common names
Ben's Bitter Bolete
IUCN Specialist Group
Mushroom, Bracket and Puffball
Kingdom
Fungi
Phylum
Basidiomycota
Class
Agaricomycetes
Order
Boletales
Family
Boletaceae
Assessment status
Assessed
Preliminary Category
LC
Proposed by
Noah Siegel
Assessors
Noah Siegel
Comments etc.
James Westrip

Assessment Notes

Justification

Caloboletus marshii is a widespread bolete in western United States. Most populations are known from the range of its preferred ectomycorrhizal partner, Coast Live Oak. Also occasionally with other oak species around the Central Valley and Sierra Nevada foothills 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).


Taxonomic notes

Extensively detailed as Boletus “marshii” in Mushrooms Demystified (Arora 1986), later formally described as Caloboletus marshii (Frank 2014).


Why suggested for a Global Red List Assessment?

Caloboletus marshii is a widespread bolete in western United States. Most populations are known from the range of its preferred ectomycorrhizal partner, Coast Live Oak. Also occasionally with other oak species around the Central Valley and Sierra Nevada foothills 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

Occurring from southern California, USA into Humboldt County in coastal/Coast range forests, typically with Coast Live Oak (Quercus agrifolia); scattered populations inland around the Central Valley, and the Sierra Nevada foothills 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 appears stable; no decline has been noted.

Population Trend: Stable


Habitat and Ecology

Ectomycorrhizal with oaks (Quercus spp.), especially Coast Live Oak (Quercus agrifolia). Typically fruiting in late summer or early fall, even before the seasonal rains.

Temperate Forest

Threats

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

Housing & urban areasUnspecified species

Conservation Actions

Control invasive plants in oak woodlands.

Site/area management

Research needed

No specific research is needed with regards to this species.


Use and Trade


Bibliography

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

Frank, J.L. 2014. Nomenclatural Novelties. IndexFungorum No. 194: 1.

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


Country occurrence

Regional Population and Trends

Country Trend Redlisted