Rhizophores robust, straight, stilt-like, up to 60 cm long and 2 mm in diameter, streaked, dichotomous at the base, located in the lower third of the stem. Stem regularly bipinnate, up to 2 m high, ascending, articulated, monostelic, streaked, glabrous, marked dorsally when dry, grooved; lateral branches regularly pinnate, up to 22 cm long, oblong in outline, ultimate ramules up to 4 cm. Leaves heteromorphic, subentire; axillary leaves lanceolate, not auriculate, lateral narrow, oblong, slightly falcate, more or less decurrent at the base in the lower part, more decurrent and narrower on the ultimate ramules, wider and barely falcate, up to 4 mm, on the main stem; intermediate leaves alternate, imbricate, a little unequal, narrow, lanceolate, slightly acuminate at the top. Strobili tetragonal, up to 15 mm, solitary at the top of the ultimate branchlets; sporophylls triangular-ovate, slightly acuminate, a little keeled.

Edges of streams, edges of sunny roads.

See African distribution.

Congo, Equatorial Guinea (incl. Bioko), Gabon.

Terrestrial.