Assessment Notes

Justification

Amanita augusta is a common and widespread species in western North America, with no recorded threats or evidence of decline. It is assessed as Least Concern (LC).

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Taxonomic notes

The western North American Amanita augusta was long referred to by the name Amanita aspera Fries (Thiers 1982, Arora 1986), a European species, and later Amanita franchetii (Boudier) Fayod, before being described as a distinct species (Bojantchev and Davis 2013).

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Geographic range

This species is widespread in the Pacific states of North America. It is very common in coastal California, north into south-east Alaska; occasional in the Sierra Nevada and Cascade Range in California and Oregon; more common in lower and mid elevations in the Washington Cascades; and occasional in the northern Rocky Mountains.

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Population and Trends

The population is widespread, and locally it is a very common species. It occurs in young to mature forests of many types. No decline has been noted.

Population Trend: stable

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Habitat and Ecology

This species is ectomycorrhizal with both conifers and hardwoods; especially pine (Pinus spp.), spruce (Picea spp.), Douglas fir (Pseudotsuga menziesii) and oak (Quercus spp.). It occurs in young to mature forests, fruiting in late summer and fall in the north, into spring in the south.

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Threats

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

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Conservation Actions

No specific conservation actions are needed with regards to this species, and no specific research is needed either with regards to this species.

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Use and Trade

No use/trade is known.

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Source and Citation

Siegel, N. 2021. Amanita augusta. The IUCN Red List of Threatened Species 2021: e.T195921713A195925896. https://dx.doi.org/10.2305/IUCN.UK.2021-2.RLTS.T195921713A195925896.en .Downloaded on 1 October 2021

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• Country occurrence