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

Rubroboletus haematinus (Halling) D. Arora & J.L. Frank

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Scientific name
Rubroboletus haematinus
(Halling) D. Arora & J.L. Frank
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 Boletus haematinus, from a collection made in Sierra County, California, USA (Thiers & Halling 1976); later transferred into the genus Rubroboletus (Frank 2015).

Why suggested for a Global Red List Assessment?

Rubroboletus haematinus is a locally common bolete in high elevation fir forests in the Sierra Nevada and southern Cascade Range, and also occurring in the southern Rocky Mountains, and the mountains in Arizona and New Mexico.

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

Geographic range

Uncommon to locally abundant in the Sierra Nevada of California, USA and southern Cascade Range of northern California and southern Oregon. Also known from the southern Rocky Mountains.

Population and Trends

Population is widespread, and shows no sign of decline. Currently known from ~50 collections, from over 25 voucher-confirmed locations in California alone. It was found 21 times during the 2011-2013 USFS strategic fungal surveys around Mt Shasta, California.

It was considered for listing by the CA Rare Fungi Working Group, who considered it under reported in California, and not in need of being included on the rare fungi list (Siegel et al 2019).

Population Trend: Stable

Habitat and Ecology

Ectomycorrhizal with conifers, likely restricted to true firs (Abies spp.) in higher elevation forests in the western North American mountains. Fruitbodies often solitary or scattered in small numbers, rarely in large patches. Fruiting in summer and fall.


Prolonged droughts and decades of fire suppression have drastically altered western montane forests, leading to thicker, denser, Abies dominated forests. As a result, hotter, stand replacing fires (rather than patchwork and understory burns) are commonplace, altering appropriate habitat drastically, and making it ill-suited for this species.

Increase in fire frequency/intensityDroughts

Conservation Actions

This species is included on the US Forest Service Northwest Forest Plan sensitive species list.

Research needed

Use and Trade

This species is toxic.


Castellano, M.A., Smith, J.E., O’Dell, T., Cázares, E. and Nugent, S. 1999. Handbook to Strategy 1 Fungal Species in the Northwest Forest Plan. U. S. Department of Agriculture, Forest Service, Pacific Northwest Research Station: Portland, OR. 195 p.

Frank, J.L. 2015. Nomenclatural novelties. Index Fungorum no. 248: 1.

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.

Thiers, H.D. and Halling, R.E. 1976. California Boletes V. Two new species of Boletus. Mycologia 68: 976-983.

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

Country occurrence

Regional Population and Trends

Country Trend Redlisted