Species ofCalvatia(Lycoperdaceae) from arctic and subarctic regions are described. The diagnostic characters inCalvatiaare discused with emphasis on strutures of peridium and capillitium and colour of gleba. Ten species are recognized. Three species:C. Candida, C. excipuliformis, C. utriformisare confined to subarctic stations, while seven species have their main distribution in the arctic zones. Three of these are new species:C. connivens, C. horrida, C. septentrionalis, while three other species are redefined after studies of type material:C. arctica, C. belliiandC. turneri.Several specimens studied show characters pointing to a hybrid origin.
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