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

Lactarius saylorii (Thiers) P.M. Kirk

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Scientific name
Lactarius saylorii
(Thiers) P.M. Kirk
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Proposed by
Noah Siegel
Comments etc.
Noah Siegel

Assessment Notes

Taxonomic notes

Described as Arcangeliella saylorii from a collection made in El Dorado County, California, USA (Thiers 1984). These sequestrate Lactarius have been called Arcangeliella. However, it’s a fruitbody form that has evolving multiple times within the genus Lactarius, this species was transferred to Lactarius (Kirk 2015).

Why suggested for a Global Red List Assessment?

Lactarius saylorii is a rare species, only known from a single collection, made in 1983 in the central Sierra Nevada mountains of California, USA. The small size, hypogeous growth, rounded to top-shaped fruitbodies with a much-reduced stipe, a pale orange to orange-brown cap, a grayish orange highly convoluted gleba exuding watery white latex when fresh, help distinguish this species.

Attempts should be made to re-locate this species, and survey for new populations.

Geographic range

Known from a single location in the central Sierra Nevada of California, USA.

Population and Trends

Currently only known from the Type collection, made in 1983. Revisits to the Type location in 2016-2018 were not successful in relocation this species.

Population Trend: Uncertain

Habitat and Ecology

Hypogeous, scattered or clustered, buried in loose sandy and rocky soil. Ectomycorrhizal, fruiting under White Fir (Abies concolor) in summer.  This species is likely dependent on mycophagy (primarily eaten by small mammals) for spore dispersal.


Too little in known about this species to assess threats. The Type location is a heavily trafficked campground, in which the habitat has drastically changed since this species was first discovered.

Conservation Actions

Research needed

Attempts should be made to relocate a population at the Type location, or new locations in similar habitat.

Use and Trade

None known.


P.M. Kirk, 2015. Index Fungorum 278: 1.

Thiers, H.D. 1984. The genus Arcangeliella Cav. in the western United States. Sydowia 37:296–308.

Siegel, N., Vellinga, E.C., Schwarz, C., Castellano, M.A. and Ikeda, D. 2019. A Field Guide to the Rare Fungi of California’s National Forests. Bookmobile: Minneapolis, MN. 313 p.

Trappe, J.M., R. Molina, D.L. Luoma, E. Cázares, D. Pilz, J.E. Smith, M.A. Castellano, S.L. Miller, & M.J. Trappe. 2009. Diversity, Ecology, and Conservation of Truffle Fungi in Forests of the Pacific Northwest. United States Department of Agriculture. Forest Service. Pacific Northwest Research Station. General Technical Report. PNW-GTR-772.

MyCoPortal. Mycology Collections Portal. Available at: http://mycoportal.org

Country occurrence

Regional Population and Trends

Country Trend Redlisted