1. Horikawaea Nog. 兜叶藓属 dou ye xian shu
J. Sci. Hiroshima Univ., Ser. B, Div. 2, Bot. 3: 46. 1937.
Plants medium-sized to rather large, rigid, yellow, yellowish green, or golden brown, glossy, forming long pendent, loose mats. Primary stems slender, elongate, creeping, with reddish rhizoids at the base; leaves scale-like, ovate, shortly acuminate, strongly concave, ecostate; secondary stems erect or erect-patent, simple, rarely branched. Leaves in 2 ranks, appressed when dry, elongate-ovate, concave, shortly acuminate, symmetric, slightly decurrent at the base; margins entire, incurved; costae slender, single, only to mid-leaf; leaf cells elongate-rhomboidal, thin-walled, smooth, becoming shorter toward apex; alar cells clearly differentiated, enlarged, subrectangular, thick-walled, porose, orange-yellow. Gemmae fusiform on secondary stems. Dioicous. Inner perichaetial leaves broadly ovate to lanceolate, sheathing at the base, abruptly long acuminate. Perichaetia on lateral branches. Setae elongate; capsules exserted, oblong-ovoid, erect, slightly wrinkled when dry; opercula conic, rostrate; stomata present; peristome highly reduced. Calyptrae cucullate. Spores spherical or tetrahedral, finely papillose.