The genus has a subcosmopolitan distribution, in much of the Northern Hemisphere, south in mountains to South America (reaching furthest south in Jujuy Province, northwest Argentina), New Guinea and the Marquesas Islands in the Pacific Ocean, but confined to climates with high humidity for most or all of the year (or, in cool climates, protected by snow cover in winter).
•
Diphasiastrum digitatum Fan Clubmoss, Southern Running-pine, or Running Cedar (eastern Canada, northeastern United States)