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

Lactarius californiensis Hesler & A.H. Sm.

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Scientific name
Lactarius californiensis
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 from a Type collection made in Mendocino County, California, USA (Hesler & Smith 1979). Previously refereed to as Lactarius uvidus group, and occasionally misidentified as L. pallescens.

Why suggested for a Global Red List Assessment?

Lactarius californiensis is a common species in northern California, likely associated with Tanoak.

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

Geographic range

From Santa Cruz County California north into central Oregon in coast and Coast Range forests, also in the northern Sierra Nevada foothills.

Population and Trends

Population is widespread, occurring in most of northern California’s mixed evergreen forests. Locally common from Sonoma county north through Humboldt County, California, occasional elsewhere. This species appears to be stable, no decline has been noted.

Population Trend: Stable

Habitat and Ecology

Ectomycorrhizal, occurring in mixed evergreen forests on Northern California and southwest Oregon. Likely associated with Tanoak (Notholithocarpus densiflorus), possibly Madrone (Arbutus menziesii) or Douglas-fir (Pseudotsuga menziesii). Fruiting in fall into winter.

Temperate Forest


No specific threats have been identified with regards to this species.

Conservation Actions

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

Research needed

No specific research is currently needed in regards to this species.

Use and Trade

None known.


Arora, D. 1986. Mushrooms Demystified. Ten Speed Press: Berkeley, CA. 959 p.

Hesler, L.R. and 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.

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