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

Suillellus amygdalinus (Thiers) Vizzini, Simonini & Gelardi

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Scientific name
Suillellus amygdalinus
(Thiers) Vizzini, Simonini & Gelardi
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Proposed by
Noah Siegel
Comments etc.
Noah Siegel

Assessment Notes

Taxonomic notes

Originally described as Boletus puniceus (Thiers 1965), however, this name was previous used for a species described from China (Chiu 1948); Thiers (1975) then changed the name to Boletus amygdalinus. Based on phylogenetic research, it was transferred into the genus Suillellus (Vizzini 2014).

Why suggested for a Global Red List Assessment?

Suillellus amygdalinus is a common bolete in oak woodlands across western North America.

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

Geographic range

Very common much of the oak zone in California, USA, south into Baja California, Mexico, with scattered populations north into the Columbia River valley in Washington.

Population and Trends

Population is widespread, occurring with oaks across the Pacific states. No decline has been noted.

Population Trend: Stable

Habitat and Ecology

Ectomycorrhizal with oaks (Quercus spp.), especially Coast Live Oak (Quercus agrifolia). Fruiting from fall into spring.


No specific threats have been identified with regards to this species.

Conservation Actions

No specific conservation actions are needed with regards to this species.

Research needed

There are at least two undescribed Suillellus species occurring in western North America in the process of being described; delimiting these species from existing records of Suillellus amygdalinus will be needed.

Use and Trade

None known.


Chiu, W.F. 1948. The boletes of Yunnan. Mycologia 40 (2): 199–231.

Siegel, N. and Schwarz, C. 2016. Mushrooms of the Redwood Coast. Ten Speed Press: Berkeley, CA. 601 p.

Thiers, H.D. 1975. California Mushrooms—A Field Guide to the Boletes. Hafner Press: New York, NY. 261 p

Wood, M.G. and Stevens, F.A. 2020. MykoWeb; California Fungi. https://www.mykoweb.com/CAF/species/Suillellus_amygdalinus.html

Country occurrence

Regional Population and Trends

Country Trend Redlisted