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

Lactarius aurantiosordidus Nuytinck & S.L. Mill.

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Scientific name
Lactarius aurantiosordidus
Nuytinck & S.L. Mill.
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Proposed by
Noah Siegel
Comments etc.
Noah Siegel

Assessment Notes

Taxonomic notes

This species was described from northern California (Nuytinck et al. 2006).

Some collections appear to have been called Lactarius deliciosus var. olivaceosordidus (Hesler & Smith 1979, Methven 1997).

Why suggested for a Global Red List Assessment?

Lactarius aurantiosordidus is a small, dingy colored member of the Lactarius ‘deliciosus’ group, growing with Sitka Spruce on the Pacific Coast from northern California into Alaska.

Not enough data exist to assess trends, or total population. Until such time data exist, I suggest listing as Data Deficient (DD).

Geographic range

Known from coastal forests from northern California into southeast Alaska, roughly following the distribution of Sitka Spruce (Picea sitchensis) (iNaturalist 2021, N. Siegel unpublished data).

Population and Trends

Population is widespread; but being a recently described, and hard to identify species, date to assess trends is currently lacking.

Population Trend: Uncertain

Habitat and Ecology

Ectomycorrhizal with Sitka Spruce (Picea sitchensis) in coastal forests. Fruiting in summer in the north, into late fall in the south.


Climate change is affecting Sitka Spruce forests on the southern portion of its range; but probably not at a scale to affect the population overall.

Widespread logging in British Columbia, Canada and southeast Alaska, USA.

Conservation Actions

Protect mature and old growth spruce forests in British Columbia and Alaska.

Research needed

Data to assess trends, and population data across the range of this species.

Use and Trade

This species is edible, but appears to be rarely collected.

Food - human


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.

Nuytinck, J., Miller, S.L. and Verbeken, A. 2006. A taxonomical treatment of the North and Central American species in Lactarius sect. Deliciosi. Mycotaxon. 96:261-307

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