The World Flora Online

Plants large, terrestrial, climbing, or epiphytic. Rhizomes stout, ascending or long scandent, dorsiventral, with roots on ventral side and several rows of fronds on dorsal side, bearing numerous scales on rhizome apex. Fronds distant, monomorphic or dimorphic, imparipinnate; stipes densely scaly at base; scales black, lanceolate or linear; lateral pinnae articulate to rachis; sterile pinnae linear-lanceolate, margin entire or serrate; veins free or anastomosing in several rows of areoles, without included free veinlets. Fertile fronds with narrow, linear pinnae. Sori dorsal on veinlets, in 1-4 rows on each side of costa, or acrostichoid, completely covering abaxial surface of pinnae, exindusiate; annulus consisting of 14-22 thick-walled cells. Spores elliptic or orbicular.

Source: [
• 3
]. 

Epiphytic or terrestrial; rhizome wide (rarely short) creeping or climbing, dorsiventral in structure with roots arising from the ventral surface; leaf–bases more or less decurrent as ridges on the upper surface of the rhizome; apex of rhizome covered with scales which may be cordate but not peltate; stipes jointed near the base in Elaphoglossum, with several vascular strands arranged in a U

Source: [
• 1
]. 

Rhizomes short- to long-creeping or climbing, clothed with scales Terrestrial, lithophytic, epiphytic or hemi-epiphytic ferns

Source: [
• 2
]. 

Fougères terrestres ou épiphytes, à rhizome rampant ou grimpant, de structure dorsiventrale, portant des écailles cordées à la base. Pétioles non articulés ou articulés, à cordons vasculaires arrangés en U. Frondes simples ou pennées, à pennes décurrentes sur le rachis. Nervures libres ou anastomosées; aréoles sans nervilles incluses. Fronde fertile acrostichoïde.

Source: [
• 10
].