• Proposed
  • Under Assessment
  • Preliminary Assessed
  • LCAssessed
  • Published

Gastroboletus subalpinus Trappe & Thiers

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Scientific name
Gastroboletus subalpinus
Trappe & Thiers
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Proposed by
Noah Siegel
Noah Siegel
Comments etc.
Anders Dahlberg
Michael Castellano

Assessment Notes

ANDERS—- I reviewed this one. NS.


Gastroboletus subalpinus is a strange looking gastroid boletes with a persistent skin covering the pores. It is an ectomycorrhizal fungus associated with conifers in young to old high elevation forests and widely distributed in such habitats in in the Sierra Nevada and Cascade Ranges in western North America. There is no evidence of decline. It can be locally abundant where suitable forest habitat exists. Therefore, it is assessed as Least Concern (LC).

Taxonomic notes

Described by Trappe and Thiers (1969), from a collection made near Mount Hood in Oregon, USA. The genus Gastroboletus is paraphyletic, and currently accommodates species from a number of genus-level lineages with semi-sequestrate to sequestrate fruitbodies. Genetic studies by Nuhn, et.al (2013) indicate a close affiliation between Gastroboletus subalpinus and the genus Boletus; hence the recombination into Boletus.

Why suggested for a Global Red List Assessment?

Geographic range

Known from mid to high elevation fir (Abies spp.) forests in western North American mountains. Common in the Sierra Nevada and southern Cascade mountains in California and Oregon, rare in Washington.

Population and Trends

Currently known from 80 locations, over a wide area in the Sierra Nevada and Cascade mountains in western North America. It is listed as an S1 species in the state of Washington, USA, (Washington Natural Heritage Program List) and is included on the Pacific Northwest Forest Plan (Castellano, 1999) as a Survey and Manage species.

Population Trend: Stable

Habitat and Ecology

Fruit bodies variable, completely buried to partially exposed in duff under conifers; rarely entirely exposed above duff layer. Ectomycorrhizal, likely associated with White Fir (Abies concolor) and Red Fir (Abies magnifica), and possibly other members of Pinaceae. It occurs in young to mature high elevation Abies forests; especially in Sierra Mixed Conifer, and Red Fir forests in California, and in slightly drier montane and Cascade eastern slope forests in Oregon and Washington.

Temperate Forest


There are no major threats to this species. It occurs in young to mature Abies forest, with a large geographic distribution.

Conservation Actions

No conservation measures are needed for this species since it is widespread and there are no major threats.

Research needed

Use and Trade

Although this is an edible species, it is rarely collected for food.

Food - human


Castellano, M., J. E. Smith, T. O’Dell, E. Cázares & S. Nugent. 1999. Handbook to Strategy 1 Fungal Species in the Northwest Forest Plan. General Technical Report PNW-GTR-476. United States Department of Agriculture.

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

Nuhn, M., M. Binder, A.F.S. Taylor, R.E. Halling & D.S. Hibbett. 2013. Phylogenetic Overview of the Boletineae. Fungal Biology 117:7-8:479-511

Thiers, H.D. & J.M. Trappe. 1969. Studies in the genus Gastroboletus. Brittonia. 21(3):244-254

Thiers, H.D. 1975. California Mushrooms – A Field Guide to the Boletes. Hafner Press.

Washington Natural Heritage Program List of Macrofungi https://www.dnr.wa.gov/publications/amp_nh_macrofungi.pdf

MyCoPortal. Mycology Collections Portal. Available at: http://mycoportal.org

Known distribution - countries

Regional Population and Trends

Country Trend Redlisted