Suillus fuscotomentosus was described from California, USA (Smith & Thiers 1964).
Suillus fuscotomentosus is a common Suillus with three-needle pines in California, occurring in both coastal and Sierra Nevada forests. No decline has been noted, and population is widespread. Therefore I recommend listing as Least Concern (LC).
California, USA; on the Central Coast north through the San Francisco Bay Area, into the Coast Range, and throughout the Sierra Nevada foothills and mountains into the southern Cascade Range in Oregon, USA.
Population is widespread and appears stable overall. Portions are under threat (ie. coastal Pinus radiata forests), but not at a scale large enough to affect overall populations.
Population Trend: Stable
Ectomycorrhizal with three-needle pines; especially Monterey Pine (Pinus radiata) and Knobcone Pine (P. attenuata) in coastal populations, and Ponderosa Pine (P. ponderosa) in Sierra Nevada populations; but apparently not with Jeffrey Pine (P. jeffreyi) in the eastern Sierra Nevada. Fruiting in fall and winter, and can be locally abundant.
Native stands of Pinus radiata are under threat from development, and a change in fire regime. Pinus ponderosus has suffered die-back from drought stress in the Sierra Nevada foothills. However, these threats are likely at a scale that has little affect on the overall population.
No specific conservation actions is needed with regards to this species.
No specific research is needed with regards to this species.
This species is edible, but rarely collected for food.
Nguyen, N., E.C. Vellinga, T.D. Bruns & P. Kennedy. 2017. Phylogenetic assessment of global Suillus ITS sequences supports morphologically defined species and reveals synonymous and undescribed taxa. Mycologia 108: 1216–1228.
Siegel, N. and Schwarz, C. 2016. Mushrooms of the Redwood Coast. Ten Speed Press: Berkeley, CA. 601 p.
Smith, A.H. and Thiers, H.D. 1964. A Contribution Toward A Monograph of North American Species of Suillus. University of Michigan Press. Ann Arbor, MI. 116 p.