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

Aureoboletus citriniporus (Halling) Klofac

Go to another Suggested Species...

Scientific name
Aureoboletus citriniporus
(Halling) Klofac
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 citriniporus (Halling 1977), from a California, USA collection made in the Sierra Nevada foothills, later transferred to the genus Aureoboletus (Klofac 2010).

Why suggested for a Global Red List Assessment?

Aureoboletus citriniporus is an ectomycorrhizal bolete occurring in oak woodlands, especially with Coast Live Oak in the greater San Francisco Bay Area. Recent reports are mostly from the Bay Area and Santa Cruz. Historic collections come from the Sierra Nevada foothills (MyCoPortal 2020), but no recent records are reported (iNaturalist 2020, Mushroom Observer 2020).

Geographic range

Most records come from Santa Cruz County through the San Francisco Bay Area, north to Sonoma County, California, USA, with scattered records in the Sierra Nevada foothills. There is a single record reported from southern California (MycoPortal 2020), and one from Corvallis, Oregon (N. Siegel pers. comm.).

Population and Trends

Population is mostly centered from Santa Cruz County to Marin County, California, through the San Francisco Bay Area; an area that is a highly developed urban sprawl. Other scattered reports come from the coastal California counties north to Humboldt County, the Sierra Nevada foothills, and a single location in Corvallis, Oregon. Although limited data is available showing trends of this species, it is likely decreasing due to habitat loss.

Population Trend: Decreasing

Habitat and Ecology

Ectomycorrhizal with oaks (Quercus spp.), especially Coast Live Oak (Quercus agrifolia). Typically in stands of oak with thick duff, or duff buildup, without a grassy or weedy under story. Fruiting from fall into winter.


Urban development leading to loss of habitat. Invasive plants, especially grasses growing in oak woodlands.

Housing & urban areasUnspecified species

Conservation Actions

Protect more oak woodlands in the Bay Area. Control invasive plants in oak woodlands.

Research needed

Additional surveys for this species in southern California, and the Sierra Nevada foothills.

Use and Trade

This species is edible, and occasionally collected for food.

Food - human


Halling, R.E. 1977. California Boletes VI. Some unreported species from the Sierra Nevada of California. Mycologia 69: 206-210.

iNaturalist. 2020. http://www.inaturalist.org

Klofac W. (2010). Die Gattung Aureoboletus, ein weltweiter Überblick. Ein Beitrag zu einer monographischen Bearbeitung. Osterreichische Zeitschrift fur Pilzkunde 19: 133–174.

Mushroom Observer. 2020. https://mushroomobserver.org/observer/map_observations?q=1a8f8

MyCoPortal. 2020. http://mycoportal.org/portal/index.php. Accessed on December 29 2020

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

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

Country occurrence

Regional Population and Trends

Country Trend Redlisted