Drepanophycus is a genus of extinct plants of the division Lycopodiophyta of Early to Late Devonian age (around 420 to 370 million years ago), found in Eastern Canada and Northeast US, China, Russia, Egypt and various parts of Northern Europe and Britain.

Vascular bundle actinostele, tracheids of primitive annular or helical type (so-called G-type).

Leaves are unbranched thorn-shaped (i.e. with a wide base, tapering to a blunt point) microphylls several mm long with a single prominent vascular thread, arranged spirally to randomly on the stem.

[1] It differs from a closely related genus of the same period, Baragwanathia, in the position of the sporangia, and the arrangement and shape of the leaves; see Drepanophycaceae for more details.

It is more derived than the coexisting genus Asteroxylon, which has enations lacking vascules, in contrast to the true leaves of Drepanophycus.