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

Suillus fuscotomentosus Thiers & A.H. Sm.

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Scientific name
Suillus fuscotomentosus
Thiers & A.H. Sm.
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Proposed by
Noah Siegel
Comments etc.
Noah Siegel

Assessment Notes

Taxonomic notes

Suillus fuscotomentosus was described from California, USA (Smith & Thiers 1964).

Why suggested for a Global Red List Assessment?

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).

Geographic range

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 and Trends

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

Habitat and Ecology

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.

Temperate Forest


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.

Housing & urban areasSuppression in fire frequency/intensityDroughts

Conservation Actions

No specific conservation actions is needed with regards to this species.

Research needed

No specific research is needed with regards to this species.

Use and Trade

This species is edible, but rarely collected for food.

Food - human


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.

Country occurrence

Regional Population and Trends

Country Trend Redlisted