3. Tetraplodon Bruch & Schimp. in B.S.G. 并齿藓属 bing-chi xian shu
Bryol. Eur. 3: 211 (fasc. 23–24. Mon. 1). 1844.
Plants medium-sized to large, sometimes rather robust, yellowish green or yellowish brown, in dense tufts, often mixed with rhizoids below. Stems erect, often branched, radiculose below. Leaves smaller below, larger above, oblong-lanceolate or oblong-ovate to somewhat obovate, sometimes slightly concave, gradually or abruptly subulate-acuminate at apex; margins plane, entire or remotely dentate above; costa percurrent to shortly excurrent; upper leaf cells oblong-hexagonal or shortly rectangular, firm-walled; lower cells narrowed and elongate, moderately thin-walled. Autoicous. Setae erect, short to elongate; capsules erect, symmetric, with small, shortly cylindrical urns, apophyses well developed, narrowly elongate-pyriform, often slightly broader and longer than the urns; opercula bluntly low conic; annuli usually absent; peristome teeth 16, reddish brown, deeply inserted below the mouth, reflexed when dry, 4 teeth joined together when young, split when mature. Calyptrae small, conic-mitrate, smooth, naked. Spores small, spherical, smooth.