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Lactarius pallidiolivaceus Hesler & A.H. Sm.

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Scientific name
Lactarius pallidiolivaceus
Author
Hesler & A.H. Sm.
Common names
 
IUCN Specialist Group
Mushroom, Bracket and Puffball
Kingdom
Fungi
Phylum
Basidiomycota
Class
Agaricomycetes
Order
Russulales
Family
Russulaceae
Assessment status
Published
Assessment date
2024-12-10
IUCN Red List Category
LC
Assessors
Gregory Mueller (Chicago Botanic Garden / IUCN SSC Mushroom, Bracket and Puffball Specialist Group); Noah Siegel (25 Prospect Hill Road, Royalston, MA 01368, US / Global Fungus Assessment)
Reviewers
Anders Dahlberg (Swedish Species Information Centre, Uppsala / IUCN SSC Cup-fungus, Truffle and Ally Specialist Group)

Assessment Notes

The content on this page is fetched from The IUCN Red List of Threatened Species: https://www.iucnredlist.org/species/272237313/272237340

Justification

Lactarius pallidiolivaceus is a widespread but uncommon species, occurring in mixed Tanoak-conifer forests in northern California and southern Oregon, USA. The species is assessed as Least Concern.

Taxonomic notes

This species was described from an Oregon, USA type collection (Hesler and Smith 1979).

There is some question if the sequestrate species, Lactarius desjardinii is distinct from this species or not. More research is needed.

Geographic range

This species occurs from Santa Cruz County, California north into central Oregon in coastal and Coast Range forests, and is also found in the northern Sierra Nevada foothills.

Population and Trends

The population is widespread, occurring in northern California and southwest Oregon in mixed evergreen forests. It is uncommon to rare, but widespread (iNaturalist 2024, MyCoPortal 2024).

Population Trend: Unknown

Habitat and Ecology

This species is ectomycorrhizal, occurring in mixed evergreen forests in northern California and southwest Oregon. It is likely associated with Tanoak (Notholithocarpus densiflorus), possibly Pacific Madrone (Arbutus menziesii) or Douglas-fir (Pseudotsuga menziesii). Fruiting is in fall and winter

Threats

No specific threats have been identified with regards to this species. However it is uncommon, and any if decline is noticed it should be noted.

Conservation Actions

No specific conservation actions are needed with regards to this species at this time. Genetic research into semi-sequestrate and sequestrate collections, and how they compare with Lactarius desjardinii, is needed. More data are also needed on this species to track the population size and trends.

Use and Trade

No use/trade is known.

Source and Citation

Mueller, G.M. & Siegel, N. 2025. Lactarius pallidiolivaceus. The IUCN Red List of Threatened Species 2025: e.T272237313A272237340. Accessed on 27 November 2025.

Country occurrence