See text Diphasiastrum is a genus of clubmosses in the plant family Lycopodiaceae.

In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), it is placed in the subfamily Lycopodioideae.

Some species superficially resemble diminutive gymnosperms and have been given common names such as ground-pine or ground-cedar.

[citation needed] Several species have been used economically for their spores, which are harvested as Lycopodium powder.

As of June 2024[update], the Checklist of Ferns and Lycophytes of the World recognized the following species:[2] Some species are treated as hybrids, although not by all sources:[2] 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).