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

Mycena hudsoniana A.H. Sm.

Search for another Species...

Scientific name
Mycena hudsoniana
Author
A.H. Sm.
Common names
 
IUCN Specialist Group
Mushroom, Bracket and Puffball
Kingdom
Fungi
Phylum
Basidiomycota
Class
Agaricomycetes
Order
Agaricales
Family
Mycenaceae
Assessment status
Under Assessment
Proposed by
Noah Siegel
Assessors
Noah Siegel
Comments etc.
James Westrip

Assessment Notes

Justification

Mycena hudsoniana is a rare snow bank species in western North America.

The habitat is under threat due to climate change and declining winter snow pack.


Taxonomic notes

Described from a collection made at Olympic National Park in Washington, USA (Smith 1941). The reported collections from Minnesota and Alberta (MyCoPortal 2021) should be re-examined, as they may be misidentified.

Field identification of Mycena species is in general impossible, and this species might have been overlooked, under sampled and/or misidentified.


Why suggested for a Global Red List Assessment?

Mycena hudsoniana is a rare snow bank species in western North America.

The habitat is under threat due to climate change and declining winter snow pack.


Geographic range

Known from mostly disjunct populations in the Pacific Northwest and northern California in the southern Cascade Range.


Population and Trends

Currently known from 14 locations in the Pacific Northwest and northern California. Gray Mycena are difficult to identify, and are rarely reported, so this is likely more common than reported. However, some of the reports likely represent misidentifications.

It is a snowbank species (Cooke 1955), restricted to western montane forest with ample winter snow pack. These forests are affected by changing climate; with warmer and drier winters that have elevated and lessened the average snowfall. Stoelinga et al. (2010) state that Cascade Range spring snowpack declined 23% during 1930-2007, and models suggest that the rate of snowpack decline with increase substantially by the end of the century (Rhoades et al. 2018).

Population Trend: Decreasing


Habitat and Ecology

Solitary or scattered in duff, typically fruiting on the edges of melting snowbanks in spring, often in montane forest. Saprotrophic on duff and debris of conifers.

Temperate Forest

Threats

Mycena hudsonianais a rare snowbank fungus dependent on thick winter snowpacks to fruit. Snowbank fungi, unique to the western North American mountains, occur in areas with ample snowpack. They fruit in the spring and summer, as the snow melts and recedes. As the climate changes, warmer and drier winters have elevated and lessened the average snowfall. Climate change, continued loss of habitat, decline in area of old growth forests, and hotter, stand replacing fires are detrimental to this species.

Snowpack decline in the western North American mountains has been well documented (Mote et al. 2005, Mote et al 2018, Zeng et al. 2018, Stoelinga et al. 2010). Stoelinga et al. (2010) state that Cascade Range spring snowpack declined 23% during 1930-2007, and models suggest that the rate of snowpack decline with increase substantially by the end of the century (Rhoades et al. 2018).

Increase in fire frequency/intensityHabitat shifting & alterationOther impacts

Conservation Actions

Protect known populations from logging and development.

Site/area protection

Research needed

Identify habitat this species occurs in, and survey for additional populations.

Population size, distribution & trends

Use and Trade

None known.


Bibliography

Cooke, W.B. 1955. Subalpine fungi and snowbanks. Ecology 36: 124–130.

Fyfe, J. C. et al. 2017. Large near-term projected snowpack loss over the western United States. Nat. Commun. 8, 14996 doi: 10.1038/ncomms14996.

Maas Geesteranus, R.A. 1992. Mycenas of the Northern Hemisphere I & II. North-Holland, Amsterdam.

Mote, P.W., Hamlet, A.F., Clark, M.P. and Lettenmaier, D.P. 2005: Declining mountain snowpack in western North America. Bulletin of the American Meteorological Society 86, 39–49.

Mote, P.W., Li, S., Lettenmaier, D.P. et al. 2018. Dramatic declines in snowpack in the western US. npj climate and atmospheric science 1, 2 (2018). https://doi.org/10.1038/s41612-018-0012-1

MyCoPortal. 2021. Mycology Collections Portal. Available at: http://mycoportal.org

Rhoades, A.M., Jones, A.D. and Ullrich, P.A. 2018. The Changing Character of the California Sierra Nevada as a Natural Reservoir. Geophysical Research Letters. DOI: 10.1029/2018GL080308

Siegel, N. 2017. United States Forest Service R5 rare species assessment. Draft internal document.

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.

Smith, A.H. 1941. Studies of North American agarics I. Contributions from the University of Michigan Herbarium 5:1–73

Smith, A.H. 1947. North American species of Mycena. University of Michigan Press, Ann Arbor.

Stoelinga, M.T., Albright, M.D. and Mass, C.F. 2010. A new look at snowpack trends in the Cascade Mountains. Journal of Climate 23: 10. 2473–2491. https://doi.org/10.1175/2009JCLI2911.1


Country occurrence

Regional Population and Trends

Country Trend Redlisted