2. Mitthyridium Robins. 匍网藓属 pu-wang xian shu
Phytologia 32: 432. 1975.
Plants small to medium-sized, yellowish green to brownish, in tufts. Stems repent, with ascending-erect branches. Leaves oblong to long-lanceolate or nearly linear, bordered all around with a band of elongate hyaline cells in a single layer (rarely multistratose), the border sometimes very broad and conspicuous, leaf margins usually toothed; cells of upper laminae isodiametric, smooth or papillose. Gemmae fusiform, borne on leaf tips, sometimes in a well-developed gemma receptacle. Setae elongate; peristome present. Calyptrae cucullate.