- Source: Calvatia pachydermica
Calvatia pachydermica is a species of puffball mushroom native to southernmost South America. Originally described in 1887 as Bovista pachydermica from a specimen collected in 1882 at Tierra Del Fuego in Argentina near Punta Arenas in Chile,: 438 this puffball was moved to the genus Calvatia in 1992. Most collections of this species have been made from southernmost Chile.: 438
German mycologist Hanns Kreisel placed it in Calvatia sect. Cretacea, which is a grouping characterized by "Exoperidium spiny or areolate. Capillitium with small or large pits. Subgleba cellular or rudimentary. Mature gleba brown or violaceous brown.": 437