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

Hydnotrya inordinata Trappe & Castellano

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Scientific name
Hydnotrya inordinata
Trappe & Castellano
Common names
IUCN Specialist Group
Cup-fungi, Truffles and Allies
Assessment status
Proposed by
Noah Siegel
Comments etc.
Noah Siegel

Assessment Notes

Taxonomic notes

Hydnotrya inordinata was described from Oregon, USA (Trappe & Castellano 2000)

Why suggested for a Global Red List Assessment?

Hydnotrya inordinata is a rare hypogeous fungus known from Oregon, USA.

Mycoportal list five collections from three locations, three other locations are referenced (Castellano et al. 1999, Hoover et al. 2015), but no other information has been found of these records.

Geographic range

Known from three sites in the Oregon Cascade Range.

Population and Trends

Currently known from five collections, from three locations (Mycoportal 2021), despite being surveyed for since the late 1990’s (Castellano et al. 1999)

Despite being reported from a collection in the Klamath Range in California (Hoover et al. 2015), and two additional locations referenced in Castellano et al. (1999), no records of these collection were found, and they were not referenced in Trappe & Castellano (2000).

Population Trend: Uncertain

Habitat and Ecology

Likely ectomycorrhizal, reportedly associated with Pacific silver fir (Abies amabilis), lodgepole pine (Pinus contorta), Douglas-fir (Pseudotsuga menziesii), and western hemlock (Tsuga heterophylla). Known sites range from 1,100 m to 2,000 m elevation. Little else is known about habitat preferences and requirements of this species.

Temperate Forest


Too little is known regarding this species’ distribution and particular habitat preferences to properly assess possible threats. Overall the habitat has suffered from prolonged droughts and decades of fire suppression, which 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 United States Forest Service Northwest Forest Plan Survey and Manage list of rare/old growth forests dependent fungi, and has been actively surveyed for since the late 1990’s. (Castellano et al. 1999). Included on the Oregon Natural Heritage rare fungi list (Oregon Biodiversity Information Center 2019), as a S3 species.

Research needed

Continued surveys for this species, and an attempt to identify habitat requirements and restraints.

Population size, distribution & trendsLife history & ecology

Use and Trade

None known.


Hoover, L.D., T.E. Carlberg, E. Rentz & C. Schreiber. 2015. Survey and Manage Category B Fungi Strategic Survey Report. USDA Forest Service, Pacific Southwest Region Northwest Forest Plan Area. United States Forest Service Draft Report.

MyCoPortal. 2021. http://mycoportal.org/portal/index.php. Accessed on February 19.

Oregon Biodiversity Information Center. 2019. Fungi Ranks: Documentation forms for state and global ranks. Available at https://inr.oregonstate.edu/orbic/rare-species/ranking-documentation/fungi-ranks. Institute for Natural Resources, Portland State University, Portland, OR.

Trappe, J.M., & M.A. Castellano. 2000. New sequestrate Ascomycota and Basidiomycota covered by the Northwest Forest Plan. Mycotaxon 75: 153–179.

Country occurrence

Regional Population and Trends

Country Trend Redlisted