Pteridophyte genera Grammitis Sw. Small erect or pendulous epiphytes, less often subepiphytes or rupestral. Sori round or slightly enlongate, sometimes an elongate coenosorus, generally in a single row either side of the costa, or scattered, superficial to deeply immersed in the lamina, borne on the basal acroscopic branch of each vein group, occasionally on other branches as well, the vein passing through the generally elongate receptacle or terminating in it, exindusiate, filamentous parphses sometimes present, sporangia on a uniseriate stalk, naked or sometimes setulose, annulus vertical, interrupted of c.18-21 thickened cells.
Spores trilete, with chlorophyll.
Species in Papuasia 1a. G. tubercuata 3a. G. mollipila Hairs on lamina margin and mid vein below solitary or binate, about as long as those on lamina undersurface, or lamina under surface glabrous 5 5a. Lamina hairs up to 0.3mm G. torricelliana Lamina hairs more than 0.6mm 10 10a. Lamina hairs 0.5-0.8mm G. pseudolocellata 15a.