Plants large, in moderate to dense mats, green, light green, or yellowish to brownish. Stems to 10 cm, creeping to ascending, with many upright shoots in dense growth, terete-foliate, irregularly pinnate, branches to 15 mm, straight, terete-foliate. Stem leaves erect-appressed or sometimes erectopatent, closely to loosely imbricate, ovate to ovate-triangular, broadest at 1/9-1/5 leaf length, slightly to occasionally strongly concave, not to weakly plicate, 1.8-3 × 0.8-1.6 mm; base rounded, broadly or sometimes narrowly decurrent; margins plane, often recurved proximally, occasionally elsewhere, serrulate to serrate; apex short to moderately acuminate; costa to 50-75% leaf length, moderately strong, terminal spine absent, sometimes small tooth present; alar cells short-rectangular, enlarged, 30-45 × 18-23 µm, walls thin, region conspicuous, of 5-10 × 5-10 cells, ; laminal cells linear, 60-140 × 7-11 µm; basal cells to 11-14 µm wide, region in 2-4 rows. Branch leaves with base often asymmetric; margins usually recurved below broadest part of leaf. Sexual condition autoicous. Seta reddish orange, 1.5-2.5(-3) cm, rough. Capsule strongly inclined to horizontal, red-brown, ovoid to elongate, curved, 2-2.5 mm; annulus separating by fragments; operculum conic. Spores 12-18 µm.
35. Brachythecium rutabulum (Hedw.) Schimp. in B.S.G. 卵叶青藓 luan ye qing xian Bryol. Eur. 6: 15. pl. 543. 1853. Pancovia rutabula (Hedw.) J. Kickx f., Fl. Crypt. Flandres 1: 94. 1867. Hypnum rutabulum Hedw., Sp. Musc. Frond. 276. 1801. Type: Europe. Plants rather large, green to yellowish green, in loose mats. Stems prostrate, to 5–8 cm long, densely irregularly branched, loosely foliate, with branchlets, often attenuate at tips. Stem leaves broadly ovate, 1.85–2.16 mm × 0.95–1.67 mm, concave, plicate, shortly acuminate, often twisted at apex, somewhat cordate, decurrent at base; margins nearly entire or serrulate near apex; costae slender, ca. 2/3 the leaf length; median leaf cells linear-rhomboidal, 43–60 µm × 9–10 µm, with angled ends, thin-walled; basal cells lax, somewhat thick-walled, rhombic; alar cells quadrate or shortly rectangular; branch leaves ovate-lanceolate, 1.26–1.58 mm × 0.54–0.72 mm, gradually acuminate. Dioicous. Setae ca. 15–20 mm long, papillose throughout; capsules ovoid or obovoid, inclined, brownish; opercula shortly conic-rostrate; endostome segments as long as exostome teeth; cilia 2–4, nodulose. Spores not seen.