Rhizome erect or prostrate, unbranched, glabrous. Lamina of frond simple, entire, more or less fleshy, glabrous, with netted venation, erect, spreading or pendulous; subtended by stipe. Fertile spike arising from sterile lamina or below, stalk fleshy. Sporangia in 2 rows, embedded in spike, opening by transverse slits.
About 50 species world-wide; 6 or 7 in Australia, 3 in Victoria.