Described from a Washington, USA Type collection (Hesler & Smith 1960).
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)
From the northern California USA coast, and northern Sierra Nevada mountains, north into Southeast Alaska, USA.
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
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.
No specific conservation actions is needed with regards to this species.
No specific research is currently needed in regards to this species.
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.