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

Hortiboletus coccyginus (Theirs) C.F. Schwarz, N. Siegel & J.L. Frank

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Scientific name
Hortiboletus coccyginus
(Theirs) C.F. Schwarz, N. Siegel & 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 from a collection made in the Sierra Nevada of California as Boletus coccyginus (Thiers 1975), later transferred to the genus Hortiboletus (Frank et al. 2020).

Why suggested for a Global Red List Assessment?

Hortiboletus coccyginus is a small to medium-sized bolete with an evenly rosy red to pink cap, yellow pores, and flesh that typically doesn’t stain blue. An uncommon species; known from ~20 locations in western North America.

Geographic range

Known from from both coastal and montane forests from central California north to Washington, east into Idaho, USA.

Population and Trends

Population is widespread but disjunct for this uncommon species. Although there are relatively few records (<30) of this species, it appears to be stable, with a number of recent records as habitat, ecology and range become better known.

Population Trend: Stable

Habitat and Ecology

Solitary, scattered, or in small clusters on ground in mixed forests. Ectomycorrhizal with a wide range of associates; Douglas-fir (Pseudotsuga menziesii), Tanoak (Notholithocarpus densiflorus), and Coast Live Oak (Quercus agrifolia) on the California coast, reported from under conifers in the California mountains. Most of the Pacific Northwest collections were from Cottonwood (Populus) forest. Fruiting in fall.


No direct threats have been identified.

Conservation Actions

Research needed

Continued reporting of collections on sites like iNaturalist will provide a better understanding of range, ecology and abundance of this species.

Use and Trade

Edible, but rarely collected for food.


Frank J.L., Siegel, N., Schwarz, C.F., Araki, B. and Vellinga, E.C. (2020). Xerocomellus (Boletaceae) in western North America. Fungal Systematics and Evolution 6: 265–288

Siegel, N. and Schwarz, C. 2016. Mushrooms of the Redwood Coast: A Comprehensive Guide to the Fungi of Coastal Northern California. Ten Speed Press, Emeryville, CA.

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. 1975. California Mushrooms—A Field Guide to the Boletes. Hafner Press, New York, NY.

Country occurrence

Regional Population and Trends

Country Trend Redlisted