Rhizome short-creeping; paleae pale brown, lanceolate, acute to broadly acute, 4.0-4.5 × 1.0 mm. Stipe indistinct, winged nearly to base; stipe hairs whitish, sparse to common, to 1.5 mm long. Lamina linear-oblanceolate, acute, (10.3-) 10.4-13.7 (-14.3) × (0.4-)0.45-0.55(-0.6) cm; hairs around and within the sori dark red-brown, stout, sometimes hooked, common to abundant, to 0.5 mm long; lamina hairs elsewhere rare, on margins and midrib, reddishbrown, to 0.4 mm; texture thinly coriaceous; veins invisible, endings not darkened; midrib raised on lower surface, concolorous with lamina. Sori oblong, oblique, in upper half of frond, 12—22 pairs, 3-5 × 1 mm; soral vein ending within sorus or extending a little beyond it, shorter than basiscopic vein, neither usually reaching margin. Sporangia (160-) 163.6-203.0 (-210) mcm long; indurated cells of annulus (10-) 10.8- 13.6(-14). Spores (23-)23.3-25.9(-27) mcm diam.

G. billardieri Willd.affinis, pilis crassis atrocastaneis circum et intra soros differt. Rhizoma breviter repens; paleae pallide brunneae, lanceolatae, acutae vel late acutae, 4.0-4.5 × 1.0 mm. Stipes indistinctus, fere ad basim alatus, pili albidi sparsi vel vulgares. Lamina linearo-oblanceolata, acuta, (10.3-)10.4-13.7(-14.3) × (0.4-)0.45-0.55(-0.6) cm; pili circum et intra soros atrocastanei, crassi, interdum uncinati, vulgares vel abundi, pili alibi castanei, rari, in margine et costa; textura tenuiter coriacea; venae non manifestae, extremae vernarum non fuscatae; costa sub lamina prominens, concolor lamina. Sori oblongi, in superiere parte frondis, 12-22 pares, 3-5 × 1 mm; vena sori in sorum terminans vel parum ultra procurrens, brevior quam vena basiscopica. non plerumque ad marginem accedens. Sporangia (160-)163.6-203.0(-210) mcm longa; cellulae induratae annuli (10-)10.8-13.6(-14). Sporae (23-)23.3- 25.9(-27) mcm diametro.