2. Pterygoneurum subsessile (Brid.) Jur.   盐土藓 yan-tu xian

Laubm.-Fl. Oesterr.-Ung. 96. 1882. Gymnostomum subsessile Brid., Muscol. Recent. Suppl. 1: 35. 1806. Type. Germany: Jena, Flörke s.n.

 

Plants 2–4 mm high, grayish green to yellowish green, gregarious or in thin tufts. Stems erect, simple or occasionally branched at the base. Leaves appressed when dry, weakly erect-spreading when moist, oblong ovate to ligulate or elliptic, strongly concave, 2–3 mm long with the awn; margins entire or serrulate at or near the base of the awn, plane or weakly incurved; costa rather stout, excurrent, ending in a long awn, nearly twice as long as the leaf length, denticulate; with 2–4 rows of green lamellae on the ventral side of costa; upper leaf cells quadrate to rounded hexagonal, 10–14 µm in diameter, moderately thick-walled, smooth or with simple or blunt C-shaped papillae; basal cells rectangular, 23–40 µm × 13–16 µm, thin-walled, smooth. Setae 0.3–0.5 mm long; capsules immersed, subhemispheric to ovoid; annuli none; opercula conic-rostrate, with a short, straight beak; peristome teeth absent. Calyptrae mitrate, smooth. Spores 35–38 µm in diameter, brownish, finely papillose.