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).
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.
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.
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
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.
There are no major threats to this species. It occurs in young to mature Abies forest, with a large geographic distribution.
No conservation measures are needed for this species since it is widespread and there are no major threats.
Although this is an edible species, it is rarely collected for food.
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