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

Calvatia cyathiformis (Bosc) Morgan

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Scientific name
Calvatia cyathiformis
(Bosc) Morgan
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Proposed by
Mikael Jeppson
Comments etc.
Mikael Jeppson

Assessment Notes

Taxonomic notes

Calvatia cyathiformis is easily confused with C. fragilis. According to Bates et al. 2009 and Moreno et al. 2010) they constitute two separate taxa on species level. Some authors however, consider them synoymous.

Why suggested for a Global Red List Assessment?

Calvatia cyathiformis is a species of xerothermic grasslands and steppes. Potential decline caused by habitat loss. Its distribution and current population status are ambiguous due synonymy or confusion with C. fragilis. DD?

Geographic range

Originally described from Carolina (N. America) and have since been reported from most continents. The true distribution is however ambiguous due to it having been confused with C. fragilis. Kreisel (1992) gives the following picture: N, C, and S. America, tropical Africa, tropical Asia and Japan. He later adds a single European record from France where he suggests that it might be introduced (Kreisel 2001). Current data in GBIF include records of C. cyathiformis from many countries, largely overlapping the distribution of the related species C. fragilis. Herbarium material should be checked and verified. Most European records probably refer to C. fragilis.

Population and Trends

Current population size and trends are unknown. However, due to habitat loss of xerothermic grasslands, a decrease in population can be suspected.

Population Trend: Uncertain

Habitat and Ecology

Calvatia cyathiformis is a species of xerothermic grasslands.


A species of xerothermic grasslands and dry mediterranean vegetation. Overgrowth due to ceased grazing as well as exploitation of its habitat (grazed grassland being transferred to cultivated farmlands).

Conservation Actions

Research needed

Research is needed to resolve the species boundaries between C. cyathiformis and closely related species, particularly C. fragils.

Use and Trade



Country occurrence

Regional Population and Trends

Country Trend Redlisted