30. Brachythecium propinnatumRedf., B. C. Tan & S. He   羽状青藓   yu zhuang qing xian

J. Hattori Bot. Lab. 79: 184. 1996. Brachythecium pinnatum Takaki, J. Hattori Bot. Lab. 15: 6. 1955, hom. illeg. Type: Japan. Honshu, Pref. Nagano, Takaki 11626.

 

Plants medium-sized, dark green or yellowish green, glossy, in dense mats. Stems prostrate, ca. 3–5 cm long, densely regularly branched, with sparse rhizoids; branches spreading, ca. 0.7–1.5 cm long, densely foliate, simple or further branched, attenuate at tips. Stem leaves appressed when dry, erect-spreading when moist, triangularly ovate-lanceolate, 1.85–2.25 mm × 0.68–0.86 mm, deeply multi-plicate, abruptly, slenderly long acuminate at apex, broadly cordate, decurrent at base; margins entire below, serrulate above, often recurved at base; costae reaching ca. 4/5 the leaf length or nearly percurrent; median cells linear, 65–90 µm × ca. 5 µm, with angled ends; basal cells lax; alar cells differentiated, hyaline, quadrate or shortly rectangular, not extending close to costa at leaf base; branch leaves smaller, ovate-lanceolate, less plicate, cordate at base; costae stout at base, slender above. Dioicous. Perichaetial leaves lanceolate, slenderly long acuminate; margins entire; costae indistinct. Setae ca. 15–20 mm long, reddish, smooth; capsules erect, cylindrical; peristome not seen. Spores not seen.