Assessment Notes

Justification

Tylopilus ammiratii is a rare bolete with a vinaceous-coloured cap when young that becomes brown with age, white to pallid pores that become buff in age and which stain brown when bruised, and a white, non-reticulate stipe. It is currently known from six localities, all in California, USA, where it is mostly associated with black oak (Quercus kelloggii). Although potentially suitable habitat is fairly widespread, more data are needed to identify the factors constituting a suitable habitat for this species; and modern taxonomic work needs to be conducted on Californian Tylopilus. Therefore, it is not possible to accurately assess the status of this species and it is listed as Data Deficient (DD).

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Taxonomic notes

It was described from a collection made in Shasta County, California, USA (Thiers 1975). This species should be compared genetically with Tylopilus 'indecisus' sensu CA (Siegel and Schwarz 2016) and T. humalis.

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Geographic range

Currently this species is known from six localities (Siegel et al. 2019); all in California, USA. Four are in the Sierra Nevada and Cascade Range foothills, one is from the Klamath Range, and one is on the San Francisco Peninsula (although this collection most likely represents Tylopilus 'indecisus' sensu CA).

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Population and Trends

This species is rare. It is currently known from six collections (although some of these records may pertain to other species). Five of the collections are older than 30 years. Although potentially suitable habitat is fairly widespread, more data are needed to identify the factors constituting a suitable habitat for this species. In addition, targeted surveys for this species, including revisiting historic localities, are needed to assess trends.

Population Trend: unknown

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Habitat and Ecology

It is ectomycorrhizal with hardwoods, likely primarily with black oak (Quercus kelloggii). It has also been reported from under manzanita (Arctostaphylos spp.) and Madrone (Arbutus menziesii), although these reports may involve other Tylopilus taxa. Fruiting occurs from early fall into winter.

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Threats

Too little is known regarding this species’ distribution and details of its habitat preferences to properly assess threats.

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Conservation Actions

No specific conservation actions are needed with regards to this species. Modern taxonomic work on Tylopilus species in California is required. Data are needed to assess population trends, and revisiting historic localities to check for presence or absence of this species would be useful. More data are also needed to identify the factors constituting a suitable habitat for this species, and to compare it genetically with Tylopilus 'indecisus' sensu CA (Siegel and Schwarz 2016) and T. humalis.

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Use and Trade

No use/trade is known.

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Source and Citation

Siegel, N. 2021. Tylopilus ammiratii. The IUCN Red List of Threatened Species 2021: e.T198479759A198487767. https://dx.doi.org/10.2305/IUCN.UK.2021-2.RLTS.T198479759A198487767.en .Accessed on 27 September 2024

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• Country occurrence