ABSTRACT
Epiphytic or terrestrial fems with creeping or erect rhizomes and with clathrate usually dark-coloured rhizome scales. Fronds with a simple or vari ously pinnately dissected blade; stipes not articulated to the rhizome and with 2 vascular strands at the base which unite upwards to form a 4-armed strand; veins free or anastomosing marginally. Sori usually linear, borne on the costal side of a vein and with a narrow or obsolete indusium. Sporangia with long stalks; spores monolete, with a perispore (Schelpe, 1970).
