4. Ectropothecium nervosum Dix. 强肋偏蒴藓 qiang le pian shuo xian
Hong Kong Naturalist, Suppl. 2: 28. 1933. Type: China. Hong Kong, Bowring 214.
Plants pale green, glossy. Other features are mostly similar to E. zollingeri, but the two species differ in several aspects. In E. zollingeri, the leaves are asymmetric, shortly acuminate with serrulate leaf apices, and the costae are shorter, only up to 1/5–1/4 the leaf length; while in E. nervosum, the leaves are symmetric, slenderly acuminate with bluntly denticulate leaf apices, and the costae are longer, up to 1/4–1/3 the leaf length.