- Scientific name
- Tylopilus humilis
- Common names
- IUCN Specialist Group
- Mushroom, Bracket and Puffball
- Assessment status
- Assessment date
- IUCN Red List Category
- Siegel, N.
- Dahlberg, A.
is a rare bolete known from fewer than 10 locations in coastal forests of northern California. Until much-needed modern taxonomic work has been conducted on Californian Tylopilus
, it is not possible to accurately assess the status of this species. Therefore, it is assessed as Data Deficient (DD).
It was described from collections made near Mendocino, California, USA (Thiers 1966).
It is known from scattered sites from Santa Cruz County, California, north into Mendocino County, California, USA.
Population and Trends
Based on current knowledge, the population is very restricted, with the species being currently known from fewer than 10 disjunct subpopulations from Mendocino County, California in the north and Santa Cruz County in the south. Data to assess trends are lacking for this species.
Population Trend: unknown
Habitat and Ecology
It is ectomycorrhizal, based on collection data, either with pine (Pinus
spp.) or possibly with manzanita (Arctostaphylo
s spp.) or Madrone (Arbutus menziesii
). Typically fruiting occurs under duff, and rarely breaking the surface. Fruiting is in fall and early winter.
No threats have been directly linked to this species. Overall, though the habitat is subject to pressure from urban development, and sand mining near the Santa Cruz subpopulations. The invasive Scotch Broom (Cytisus scoparius
) is also potentially impacting the species' habitat, but the overall impact is uncertain because of the paucity of information currently available.
There is a need to protect any subpopulations found on unprotected lands. Work should be conducted in order to assess population trends. Invasive plant removal, specifically Scotch Broom (Cytisus scoparius
), from areas this species is known to occur could be beneficial. Modern taxonomic work is needed on Tylopilus
species in California.
Use and Trade
No use/trade is known.
Source and Citation
Siegel, N. 2021. Tylopilus humilis. The IUCN Red List of Threatened Species 2021: e.T198479762A198489261. https://dx.doi.org/10.2305/IUCN.UK.2021-2.RLTS.T198479762A198489261.en
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