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

Cortinarius magnivelatus Dearn. ex Fogel

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Scientific name
Cortinarius magnivelatus
Dearn. ex Fogel
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 Pholiota magnivelata (Morse 1941), from a collection made at “General Grant National Park” (now Kings Canyon National Park), California, USA. Invalidly transferred into the genus Cortinarius by Thiers & Smith (1969), corrected by Fogel (1994).

Why suggested for a Global Red List Assessment?

Cortinarius magnivelatus is medium-sized mushroom with a stout stature, and hypogeous fruiting habit (typically fruiting under the duff). Recognizable by its white to whitish tan cap, a persistent white partial veil of thick, radially fibrillose membrane that remains mostly unbroken even in age, and rusty brown spores.

Currently known from over 100 records from ~fifty locations in California, Oregon, and Nevada, USA, and believed to be under reported. This, along with no recorded decline suggest that this species should be listed as Least Concern (LC).

Geographic range

Widespread in the Sierra Nevada, and southern Cascade Range in California and Oregon, and from two high elevation locations in eastern Nevada.

Population and Trends

Population is widespread, and no decline has been noted. Currently known from over 100 records from ~fifty locations in California, Oregon, and Nevada, USA, and likely under reported.

Population Trend: Stable

Habitat and Ecology

Solitary, scattered, or in small clusters under duff or in soil. Typically forming ‘shrumps’ (pushing up mounds of duff), rarely becoming exposed, or only breaking the surface in areas with hard-packed ground and/or a thin duff layer. Ectomycorrhizal with conifers, likely primarily associated with fir (Abies spp). This species does not appear to be restricted to mature forest, and has been found fruiting after heavy logging disturbance.  Fruiting in late spring and summer.

Temperate Forest


No specific threats have been identified with regards to this species.

Conservation Actions

No specific conservation actions is needed with regards to this species.

Research needed

Additional research into range of this species; does in occur into the Blue Mountains of Oregon, or the Rocky Mountains.

Population size, distribution & trends

Use and Trade

None known.


Castellano, M., Smith, J.E., O’Dell, T., Cázares, E. and Nugent, S. 1999. Handbook to Strategy 1 Fungal Species in the Northwest Forest Plan. General Technical Report PNW-GTR-476. United States Department of Agriculture.

Fogel, R. 1994. Materials for a hypogeous mycoflora of the Great Basin and adjacent cordilleras of the Western United States II. Two subemergent species Cortinarius saxamontanus, sp. nov., and C. magnivelatus, plus comments on their evolution. Mycologia 86:795–801

Morse, E.E. 1941. A new western Pholiota. Mycologia 33:367–370

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.

Thiers, H.D. and Smith, A.H. 1969. Hypogeous Cortinarii. Mycologia 61: 526–536

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

Country occurrence

Regional Population and Trends

Country Trend Redlisted