1. Gymnostomum aeruginosum Smith 铜绿净口藓 tong-lv jing-kou xian
Fl. Brit. 3: 1163. 1804. Type. Europe.
Gymnostomum rupestre Scheich. ex Schwaegr., Sp. Musc. Frond., Suppl. 1, 1: 31, f. 11. 1811.
Plants medium-sized, 20–30 mm high, often bright green or copper green, in dense tufts. Stems erect, simple, rarely branched. Leaves narrow, usually linear-lanceolate, blunt at the apex; margins plane, entire; costa stout, ending below the apex; upper leaf cells rounded hexagonal, pluripapillose; basal cells elliptic to irregularly rectangular, smooth.