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

Lactarius occidentalis A.H. Sm.

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Scientific name
Lactarius occidentalis
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 Washington, USA Type collection (Hesler & Smith 1960).

Why suggested for a Global Red List Assessment?

Lactarius occidentalis is a common species with alder in the Pacific Northwest; from northern California into Alaska.

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

Geographic range

From the northern California USA coast, and northern Sierra Nevada mountains, north into Southeast Alaska, USA.

Population and Trends

Population is widespread across the Pacific Coast of North America, and Cascade Range in the Pacific Northwest, population is stable, possibly improving with current forest management.

Population Trend: Improving

Habitat and Ecology

Ectomycorrhizal with alder (Alnus spp.), especially in lowland forests. Common across much of its range, fruiting in late summer and fall.


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.


Hesler, L.R. and Smith, A.H. 1960. Studies on Lactarius II—The North American Species of Sections Scrobiculus, Crocei, Theiogali, and Vellus. Brittonia 12(4): 305-350.

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

MyCoPortal. 2021. http://mycoportal.org/portal/index.php. Accessed on January 11.

Country occurrence

Regional Population and Trends

Country Trend Redlisted