4. Lindbergia Kindb. 细枝藓属 xi-zhi xian shu
Gen. Eur. N. Amer. Bryin. 15. 1897.
Plants slender, bright green to brownish green, dull. Stems slender, numerously irregularly branched; paraphyllia few or lacking. Leaves densely imbricate when dry, erect-spreading when moist, ovate to ovate-lanceolate, slightly concave, somewhat decurrent at base; margins plane, usually entire, rarely faintly serrulate above; costa single, strong, ending well below leaf apex; leaf cells thin-walled, loosely arranged, oval to irregularly rhomboidal, smooth or unipapillose; marginal leaf cells smaller, quadrate to subquadrate, with several rows of quadrate to flatly quadrate cells near basal margins. Monoicous. Inner perichaetial leaves larger, pale green, erect, sheathing at base, lanceolate above, gradually tapered to subulate at apex. Setae erect; capsules oblong-ovoid, erect, rarely curved, with small mouth; annuli sometimes differentiated; peristome double; exostome teeth lanceolate, yellowish, papillose, fused at base, blunt at apex, without striolate, with folded ridges on outer surfaces, trabeculate on inner surfaces; endostome segments finely papillose; basal membrane moderately high; cilia lacking; opercula conic, blunt. Spores spherical or ovoid, coarsely and densely papillose.