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

Chroogomphus tomentosus (Murrill) O.K. Mill.

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Scientific name
Chroogomphus tomentosus
(Murrill) O.K. Mill.
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 Gomphidius tomentosus, from a Washington, USA Type collection (Murrill 1912), later transferred into the genus Chroogomphus (Miller 1964) where is resides today.

Why suggested for a Global Red List Assessment?

Chroogomphus tomentosus is a common species in hemlock forests of northern California, the Pacific Northwest, into south-central Alaska.  No decline has been recorded; it should be listed as Least Concern (LC).

Geographic range

Widespread in western North America; on the coast, it occurs from Sonoma County in northern California, USA, north into South-central Alaska. In the mountains, it occurs from the southern Cascade Range in Oregon, north into British Columbia, Canada, with scattered records east into the northern Rocky Mountains.

Population and Trends

Population is widespread, and it is a very common species. No decline has been recorded.

Population Trend: Stable

Habitat and Ecology

Chroogomphus tomentosus has an obligatory relationship (likely as parasite) with Aureoboletus mirabilis, which in turn is ectomycorrhizal with hemlock (Tsuga spp.). It is especially common in the Pacific Northwest into southeast Alaska, fruiting in late summer and fall.

Temperate Forest


No specific threats have been identified with regards to this species.

Conservation Actions

No specific conservation actions have been identified with regards to this species.

Research needed

No specific research is needed with regards to this species.

Use and Trade

Chroogomphus tomentosus is edible, but only occasionally collected for food.

Food - human


iNaturalist. 2020. http://www.inaturalist.org

Miller Jr., O.K. 1964. Monograph of Chroogomphus (Gomphidiaceae). Mycologia 56: 526-549.

Miller Jr., O.K. 2003. The Gomphidiaceae revisited: a worldwide perspective. Mycologia 95(1): 176-183.

Murrill, W.A. 1912. The Agaricaceae of the Pacific coast—III. Mycologia 4(6): 291-308. iNaturalist. 2020. http://www.inaturalist.org

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