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

Lactarius kauffmanii Hesler & A.H. Sm.

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Scientific name
Lactarius kauffmanii
Hesler & 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

Described by Hesler and Smith (1979) based on a Type collection from Idaho, USA.

Why suggested for a Global Red List Assessment?

Lactarius kauffmanii is a common milk cap, occurring in hemlock and fir forests across western North America.

Population is widespread, and no decline has been observed. We recommend it should be listed as Least Concern (LC).

Geographic range

Widespread in western North America, from the northern California coast and Cascade Range, through the Pacific Northwest, east into the Rocky Mountains, north into British Columbia, and southeast Alaska on the coast.

Population and Trends

Lactarius kauffmanii is a common species with a widespread population; occurring in young to mature hemlock (Tsuga spp.) and fir (Abies spp.) forests. No decline has been observed.

Population Trend: Stable

Habitat and Ecology

Ectomycorrhizal with fir (Abies spp.), hemlock (Tsuga spp.) and possibly other conifers, Common in fall, in young to mature forests across northern California and the Pacific Northwest.


No threats have been identified with regards to this species.

Conservation Actions

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

Research needed

There is some variation with morphology of this species; modern taxonomic work and genetic sequencing delimit species parameters.

Use and Trade

None known.


Hesler, L.R. & Smith, A.H. 1979. North American Species of Lactarius. University of Michigan Press: Ann Arbor, MI. 841 p.

iNaturalist. 2021. Available at: http://www.inaturalist.org

Methven, A.S. 1997. The Agaricales (Gilled Fungi) of California. 10. Russulaceae II. Lactarius. Mad River Press: Eureka, CA. 79 p.

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

Siegel, N. and Schwarz, C. 2016. Mushrooms of the Redwood Coast. Ten Speed Press: Berkeley, CA. 601 p.

Country occurrence

Regional Population and Trends

Country Trend Redlisted