Hypopterygium canadense Kindberg; H. fauriei Bescherelle

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.

Capsules mature summer. Limy humus, limestone, outcrops, cliffs, small caverns, moist, shady forests, Pacific coastal islands; low elevations (0-100 m); B.C.; Alaska; Asia.

Hypopterygium flavolimbatum a small, striking moss with erect, bright green fronds of neatly arranged dimorphic leaves.