Toothed Snailfern

serrulata: finely toothed, referring to the margins of this species.

Rhizome erect, up to 1 mm thick, scales brown, lanceolate, up to 1 mm long. Fronds tufted, erect, firmly membranous, subsessile, fertile fronds longer than sterile fronds. Stipe very short, brown, glabrous. Lamina up to 35 × 2 mm, glabrous, linear to very narrow oblanceolate in outline, base long tapering, apex broadly acute to rounded, deeply pinnatifid about halfway to the midrib into acute triangular or oblong obtuse lobes each with a single conspicuous vein, midrib immersed. Sori 6-8 per frond, borne on the veins in the widened upper third part of the frond, fusing to form a soral mass at maturity.

Annobon, Bioko, Coté d'Ivoire, Equatorial Guinea, Gabon, Guinea, Liberia, Madagascar, Sierra Leone and Eastern Zimbabwe.