1) Fungus genus 2) Genus calvatia 
Calvatia is a genus of puffball mushrooms that includes the spectacular giant puffball C. gigantea. It was formerly classified within the now-obsolete order Lycoperdales, which, following a restructuring of fungal taxonomy brought about by molecular phylogeny, has been split; the puffballs, Calvatia spp. are now placed in the family Agaricaceae of...
(from the article `Lycoperdaceae`) Calvatia is a genus of about 35 species that are especially common in temperate regions. The giant puffball (C. gigantea), edible while young and ...
[n] - genus of puffballs having outer casings whose upper parts break at maturity into angular pieces to expose the spores
genus Calvatia noun genus of puffballs having outer casings whose upper parts break at maturity into angular pieces to expose the spores