Similar in habit to G. microphylla, differing as follows: leaflets commonly 4-5 mm apart; segments of lamina less than 1 mm long and wide; lower surface glaucous, deeply concave, with edges much reflexed and the surface adjacent to the costa also swollen; many small thin scales, with slender crisped marginal hairs, all along costules; sporangia 2 or 3, not in a depression in the lamina. At very high altitudes often only unbranched fronds, very densely scaly, are produced.
Abundant in open scrub (on both dry stony and wet ground) on volcanic mountains throughout W. Java and Sumatra, 1800-3600 m, at these altitudes apparently less abundant on granite mountains in Borneo; densely scaly at highest elevations both in N. Sumatra and in New Guinea (G. squamosissima Copel.).
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