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  • Under Assessment
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Hydnotrya inordinata Trappe & Castellano

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Scientific name
Hydnotrya inordinata
Author
Trappe & Castellano
Common names
 
IUCN Specialist Group
Cup-fungi, Truffles and Allies
Kingdom
Fungi
Phylum
Ascomycota
Class
Pezizomycetes
Order
Pezizales
Family
Discinaceae
Assessment status
Assessed
Preliminary Category
EN C2a(i)
Proposed by
Noah Siegel
Assessors
Gregory Mueller
Contributors
Noah Siegel

Assessment Notes

Justification

Hydnotrya inordinata is known from five collections from three sites in the Oregon Cascade Range. Reports of specimens in the Klamath Range in California and from 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). There are no records of this species post 1996 in gbif.org and the only record in mycobank.org was collected in 2002. The species is ranked as Imperiled (G2) by NatureServe and is on the Oregon Natural Heritage rare fungi as a S3 species. Given that it has been searched for over the past 30 years without success, it is likely a very rare species.  Even assuming that there could be 500 x more individuals than the 5 currently known only results in an estimated maximum population size of 2,500, distributed in several small disjunct subpopulations. Its habitat has been negatively impacted by an increase in fire frequency and intensity, with an associated inferred decrease in population size. The species is precautionarily assessed as Endangered.


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

Hydnotrya inordinata is known from five collections from three sites in the Oregon Cascade Range (gbif.org, queried December 2024).


Population and Trends

Currently known from five collections, from three locations (gbif.org), 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). There are no records of this species post 1996 in gbif.org and the only record in mycobank.org was collected in 2002. The species is ranked as Imperiled (G2) by NatureServe https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.637215/Hydnotrya_inordinata) and on the Oregon Natural Heritage rare fungi list (Oregon Biodiversity Information Center 2019), as a S3 species. Given that it has been searched for over the past 30 years without success, it is likely a very rare species.  Even assuming that there could be 500 x more individuals than the 5 currently known only results in an estimated maximum population size of 2,500, distributed in several small disjunct subpopulations. 

Population Trend: Uncertain


Habitat and Ecology

It is likely ectomycorrhizal, reportedly associated with Pacific silver fir (Abies amabilis), lodgepole pine (Pinus contorta), Douglas-fir (Pseudotsuga menziesii), and western hemlock (Tsuga heterophylla). The 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

Threats

Insufficient data is available regarding this species’ distribution and particular habitat preferences to assess possible threats with confidence. However, overall its 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 (Steel et al., 2023). 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 and NatureServe ranks the species G2.

Site/area protectionSite/area management

Research needed

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

Population size, distribution & trendsLife history & ecology

Use and Trade

None known.


Bibliography

GBIF. 2024.  https://www.gbif.org/occurrence/search?taxon_key=3492529

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. 2024. http://mycoportal.org/portal/index.php. Accessed on December 2024

NaturServe Explorer. 2024. https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.637215/Hydnotrya_inordinata

Steel, Zachary L., Gavin M. Jones, Brandon M. Collins, Rebecca Green, Alexander Koltunov, Kathryn L. Purcell, Sarah C. Sawyer, et al. 2023. “ Mega-Disturbances Cause Rapid Decline of Mature Conifer Forest Habitat in California.” Ecological Applications 33(2): e2763. https://doi.org/10.1002/eap.2763

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