7. Bruchia Schwaegr. 小烛藓属 xiao-zhu xian shu
Sp. Musc. Frond., Suppl. 2(1): 91. 1824.
Plants minute to small, yellowish green or brown, in loose tufts or mixed mats. Stems erect, simple or sparsely branched, radiculose only at the base; central strand absent or slightly differentiated. Leaves narrowly ovate-lanceolate to subulate-acuminate from a broader, oblong-ovate base, becoming larger and more crowded above; margins entire, often recurved; costa single, subpercurrent to shortly excurrent, often filling most of the subula; upper cells rectangular to subquadrate, thick-walled, smooth or projecting at the back because of thickened upper ends; lower cells elongate, laxer, thin-walled; alar cells not differentiated. Autoicous or paroicous. Perichaetial leaves larger than the vegetative leaves. Setae very short, erect, or slightly curved; capsules ovoid or obovoid to pyriform to oblong-pyriform, immersed to shortly exserted, ending with a straight apiculus or beak, often with a well developed neck, 1/5–1/2 or more of the total capsule length; opercula and peristome none; stomata numerous in the neck of capsules. Calyptrae mitrate, smooth or coarsely papillose, lobed at the base. Spores large, 20–55 µm in diameter, subreniform, ± warty or pitted, usually with distinct proximal and distal surfaces.