Ophioglossaceae Martinov
Sporangia in close double marginal rows, eusporangiate, without annulus, bivalvate; spores thick-walled. Prothallus subterranean, fleshy, without chlorophyll; rhizome short, erect; roots thick. Lvs on naked fleshy stalks bearing basal stipule-like appendages, us. solitary, divided into an adaxial fertile and an abaxial sterile seg., not circinate in vernation. Mainly terrestrial, perennial, fleshy herbs of wide distribution.
