Syn. Musc. Frond. 2: 10. 1850.
Plants 1–2.5(–3) cm. Leaves of stipe and basal fronds in 8 rows, to 0.9 mm; dorsal frond leaves present on basal portion of stipe; distal stipe leaves often asymmetric, 1.2–1.7(–2) mm, margins entire to evenly serrate in distal 1/4–1/2; all leaves ovate to very short-acuminate; costa short or to 4/5 leaf length. Perichaetia with paraphyses absent. Seta 1–1.5(–2.5) cm, smooth or weakly papillose distally. Capsule 1–1.5 mm; operculum rostrate, 1.2–1.5 mm.
Phenology: Capsules mature summer.
Habitat: Limy humus, limestone, outcrops, cliffs, small caverns, moist, shady forests, Pacific coastal islands
Elevation: low elevations (0-100 m)
B.C., Alaska, Asia.
Hypopterygium flavolimbatum is a small, striking moss with erect, bright green fronds of neatly arranged dimorphic leaves.