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

Suillus ponderosus A.H. Sm. & Thiers

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

Assessment Notes

Taxonomic notes

Described from western North America (Smith & Thiers 1964). Suillus imitatus var. viridescens is a synonym (Nguyen et al. 2013).

Why suggested for a Global Red List Assessment?

Suillus ponderosus is a common and widespread species in western North America, growing with young to mature Douglas-fir from central California into southern British Columbia.

Population is stable; and under no threat. It should be listed as Least Concern (LC).

Geographic range

Pacific States of North America; from southern British Columbia, Canada, south from coast to Cascade Range in the Pacific Northwest, and coast to Coast Range south to central California, USA.

Population and Trends

Population occurs over a widespread area, and locally is very common. There is no indication of any decline.

Population Trend: Stable

Habitat and Ecology

Ectomycorrhizal, associated with Douglas-fir (Pseudotsuga menziesii) in young to mature forest, and urban areas. Common, especially in young Douglas-fir forests in the Pacific Northwest.

Temperate Forest


There are no major threats to this species. It is common, and found with young to mature trees, in both urban and forested habitats.

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


MyCoPortal. 2021. Mycology Collections Portal.  Available at: http://mycoportal.org

Nguyen, N., Kerekes, J.F., Vellinga, E.C. and Bruns, T.D. 2013. Synonymy of Suillus imitatus, the imitator of two species within the S. caerulescens/ponderosus complex. Mycotaxon 122: 389-398.

Nguyen, N., Vellinga, E.C., Bruns, T.D. and Kennedy, P. 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