14. Didymodon rigidulus Hedw. 硬叶对齿藓 ying-ye dui-chi xian
Sp. Musc. Frond. 104. 1801. Barbula rigidula (Hedw.) Mild., Bryol. Siles. 118. 1869, hom. illeg. Type. Europe.
Plants small to medium-sized, 10–20 mm high, dark green to yellowish green, in dense tufts. Stems erect, branched. Leaves appressed when dry, reflexed to squarrose when moist, triangular or ovate-lanceolate, gradually acuminate at the apex; margins entire, revolute; costa stout, percurrent; upper leaf cells rounded hexagonal, thick-walled, pluripapillose; basal cells shortly rectangular, smooth. Gemmae often present, multicellular.