Bull. Soc. Linn. Normandie II, 4: 120 (1870).

Protolog: Data lacking.

Protolog type data: Data lacking.

Type locality: Australia, West Australia, Swan River, 1846, Verreaux (PC - holotype; H-NYL 37491 - isotype [usnic acid]).

Type locality coordinates: WGS84 32°3'16"S, 115°44'6"E, -32.054444°, 115.735°, UTM 50H 380580 6452830.

Molecular barcode: Data lacking.

Thallus: pale green to grey-green, erect to pendulous, 3 - 10 cm long, exceptionally to 20 cm; branching sparse in the basal region of the primary branches, becoming dense and irregular towards the apices where small branchlets form tufts; branch width 0.2-0.5-1.0 mm, primary branches usually subterete and fine, or thick, compressed and coarse, branches never tortulose, often subsidiary short branchlets occur at right angles to the primary branch, apices of branchlets often hooked; surface matt, smooth or furrowed, longitudinal splitting occurs on the surface in coarser forms; pseudocyphellae often present; holdfast delimited although several branches arise from it, attachment of branches to the substrate at intervals along their lenght may occur; soralia absent. Apothecia uncommon, lateral on the primary branches, usually towards the base; disc 0.5-1.0-1.2 mm diam., plane to convex, margin entire; spores ellipsoid to fusiform, straight, 12-16-20 / 4-5-6 µm. Pycnidia unknown (Stevens 1987: 153).

Photobiont: Data lacking.

Chemistry: Usnic acid only (Stevens 1987: 153).

Ecology: Corticolous, often on Avicennia marina, rarely saxicolous (Stevens 1987: 153).

Distribution Type: Australia and New Zealand.