Plants medium-sized, in moderately loose to dense tufts, light to dark green or yellowish to brownish. Stems to 10 cm, creeping to arching, slightly curved or flexuose, terete-to subcomplanate-foliate, julaceous along some portions of stem, occasionally regularly pinnate, branches to 7 mm, straight to slightly curved, subcomplanate- to complanate-foliate. Stem leaves erect, or patent and twisted to contorted, ovate-triangular to ovate, broadest at 1/7 leaf length or below, not or slightly plicate, longer than broad, 1-1.3(-1.6) × 0.7-1.1 mm; base decurrent; margins serrulate or serrate almost to base; apex acute or gradually to abruptly short-acuminate, ; costa to 60-80% leaf length, strong, terminal abaxial spine present; alar cells short-rectangular, to 30 × 12-16 µm, walls moderately thick, region of many cells, pellucid, not reaching margins, gradually differentiated; laminal cells 20-40 × 4-6 µm, variable on different leaves on same plant, 3-8:1, strongly prorate to prorate-papillose on abaxial surface; basal cells 10-13 µm wide, region in 1 or 2 rows. Seta 1-2 cm. Capsule inclined to horizontal, slightly curved, 1.5-2 mm. Spores 14-18µm.
3. Bryhnia novae-angliae (Sull. & Lesq.) Grout 燕尾藓 yan wei xian Bull. Torrey Bot. Club 25: 229. 1898. Hypnum novae-angliae Sull. & Lesq., Musci Bor.-Amer. 1: 73. 1856. Type: U.S.A. (New England). Bryhnia higoensis Takaki, J. Hattori Bot. Lab. 16: 11. 1956. Bryhnia noesica (Besch.) Broth., Nat. Pflanzenfam. I(3): 1158. 1909. Brachythecium noesicum Besch., Ann. Sci. Nat., Bot., ser. 7, 17: 377. 1893. Bryhnia noesica var. lutescens Cardot, Bull. Soc. Bot. Genève, ser. 2, 3: 294. 1911. Bryhnia sublaevifolia Broth. & Paris in Cardot, Bull. Soc. Bot. Genève, ser. 2, 3: 294. 1911. Bryhnia sublaevifolia var. rigescens Cardot, Bull. Soc. Bot. Genève, ser. 2, 3: 294. 1911. Plants rather robust, in large, dense mats. Stems prostrate, to 6–8 cm long, irregularly subpinnately or sparsely branched. Stem and branch leaves more or less similar, usually twisted when dry, broadly ovate, 1.17–1.58 mm × 0.54–1.0 mm, concave, plicate, rather abruptly narrowed to a slender, sometimes twisted apex, often decurrent at base; margins serrulate above base; costae rather strong, ending above mid-leaf, sometimes projecting at tips; median leaf cells linear-rhomboidal, 45–63 µm × 9–11 µm, thin-walled; basal cells shorter; alar cells distinctly differentiated, inflated, hyaline, shortly rectangular to rounded-hexagonal. Perichaetial leaves lanceolate, ecostate. Setae 10–20 mm long, reddish brown, papillose; capsules shortly cylindrical; peristome not seen. Spores not seen.