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.

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

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 materials should be checked and verified. Most European records probably refer to C. fragilis.

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

Calvatia cyathiformis is a species of xerothermic grassland.

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 farmland).

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

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