Rhizome erect to short-creeping; plants often colonial, fronds rather lax; paleae light brown, lanceolate, acute or rarely obtuse, 1.9-4.0 × 0.3-0.7 mm. Stipes indistinct, winged to base (usually more so than in G. billardieri); stipe hairs absent or very rare, whitish, to 1.0 mm. Lamina linear-oblanceolate, acute (2.2-) 4.0-9.6 (-12.0) × (0.2-) 0.28-0.50 (-0.65) cm; lamina hairs absent or very rare, as those of stipe; texture coriaceous; veins invisible, vein endings sometimes marked by a black marking, perhaps a hydathode, on the upper surface; midrib raised on lower surface, concolorous with or slightly darker than lamina. Sori oblong, oblique, in upper 1/3 to 2/3 of frond, 4-21 pairs, 1.5-5.0 × 1.0-1.5 mm; soral vein ending within the sorus or extending a little beyond it, shorter than basiscopic vein, neither approaching margin very closely. Sporangia (180-) 212.6-269.0(-300) mcm long; indurated cells of annulus (8-)10.4-13.0(-15). Spores (25-)29.8-38.0(-50) mcm diam.