longistipa S.G.Hao (1989)[1] Discalis is a genus of extinct vascular plants of the Early Devonian (Pragian or Siegenian stage, around 413 to 411 million years ago).

Fertile stems bore disc-shaped sporangia laterally on stalks up to 5 mm long, forming open spikes.

[1] The evolutionary relationship between spines in early plants and the small leaves ('lycophylls') of later lycopsids (club-mosses and allies) has been much discussed.

[3] A cladogram published in 2004 by Crane et al. places Discalis in a paraphyletic stem group of broadly defined "zosterophylls", basal to the lycopsids (living and extinct clubmosses and relatives).

The Gosslingiales are considered to be zosterophylls with indeterminate growth and fertile branches generally showing circinate vernation (initially curled up).