Achrophyllum dentatum

Filamentous, often branched gemmae occasionally produced on intramarginal cells of leaf surfaces. Mats on soil, rocks, logs or tree fern trunks, often in running water, grey- or yellow-green. Stems 0.5–5 cm long, often with few short branches, with moderately dense red-brown rhizoids on lower stems, central strand present. Leaves flat, crisped when dry, easily detaching from stem if rubbed; costa extending c. 50–75% of leaf length, short-forked near mid-leaf; apex round or obtuse; margins coarsely dentate to erose-denticulate, plane, lateral leaves slightly differing from dorsal and ventral most leaves; lateral leaves asymmetrical at base, oblong-ovate to spathulate, 2.3–4.4 mm long, 1–2 mm wide; dorsal and ventral leaves symmetrical, elliptic, (1.6–) 2–2.8 mm long, (1–) 1.4–1.9 mm wide; laminal cells near apex hexagonal, 30–50 μm long, 25–40 μm wide, smooth; laminal cells near base elongate-hexagonal to rectangular, 100–120 μm long, 40–50 μm wide, smooth. Setae 12–20 (–25) mm long, dark red to purple. Capsule oblong to ovoid, straight, 1–2 mm long. Operculum rostrate, c. 0.8 mm long.