• Proposed
  • Under Assessment
  • Preliminary Assessed
  • Assessed
  • DDPublished

Lepiota viridigleba (Castellano) Z.W.Ge, Castellano & M.E.Sm.

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Scientific name
Lepiota viridigleba
(Castellano) Z.W.Ge, Castellano & M.E.Sm.
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
IUCN Red List Category
Proposed by
Else Vellinga
Else Vellinga
Anders Dahlberg
Comments etc.
Jean Berube

Assessment Notes

Taxonomic notes

The current name for this species is Lepiota viridigleba (Ge & Smith 2013).

Synonym: Amogaster viridiglebus Castellano 1995

Why suggested for a Global Red List Assessment?

A high-altitude species from the Sierra Nevada, southern Cascades range in eastern California (USA), known only from two collections. It has not been found again at the type locality despite yearly mycological courses at that site. It has not been detected in scat of small mammals or other environmental sources. Habitat loss due to forest fires and forest logging (timber industry) is the main threat.
Suitable habitat is available, but has not been extensively explored yet.

Geographic range

known from two locations: the campus of the San Francisco State University’s Sierra Nevada Field station along Highway 49, Plumas National Forest, Sierra County (California, USA), and east of McCloud, in the Shasta-Trinity National Forest, Siskiyou County (California, USA).
The AOO is 8,000 km2 and the EOO zero (0.000 km2) (calculated with GeoCat).

Population and Trends

Only known from two sites where it has been collected. The type locality is investigated every year in the right season during a mycology course, and the species has never been found there again since the find in 1987.

Population Trend: Uncertain

Habitat and Ecology

A hypogeous fungus, presumably saprotrophic, known from two sites with slightly different habitat:
1. in mixed conifer wood with Populus, at around 2100 m asl (Castellano 1995);
2. in Abies concolor/Abies magnifica forest at around 1500 m asl.


Fire is the main threat in these dry mountains of California. Forest fires have been suppressed for the last century, and the fires that occur in the last years are much more intense than before and impact big areas (see for instance information on a wildfire in 2013, the Rim Fire: http://en.wikipedia.org/wiki/Rim_Fire).

Conservation Actions

Research needed

Use and Trade


Castellano MA, 1995. NATS truffle and truffle-like fungi. 4: Amogaster viridigleba gen. et sp. nov., a new truffle-like fungus from the Sierra Nevada. Mycotaxon 55:185–188.

Ge Z-W, Smith ME, 2013. Phylogenetic analysis of rDNA sequences indicates that the sequestrate Amogaster viridiglebus is derived from within the agaricoid genus Lepiota (Agaricaceae). Mycological Progress 12: 151–155.

Trappe JM et al. 2009. Diversity, ecology, and conservation of truffle fungi in forests of the Pacific Northwest. General Technical Report PNW-GTR-772.

Known distribution - countries

Regional Population and Trends

Country Trend Redlisted