Neckeraceae

Diagnosis: Plants small to robust, mostly pale to yellowish green, often large, epiphytic colonies, not stipitate-frondose; primary stem stoloniform, leaves remote, scale-like; secondary stems often flexuose, strongly complanate. Secondary stem leaves somewhat dimorphous, the lateral leaves complanate, the dorsal leaves appressed when dry, apiculate, round or truncate at apex, asymmetric, often transversely undulate; margins crenulate at apex; costa usually single and extending beyond mid-leaf, or short and forked. Branch leaves similar to secondary stem leaves but smaller. Median laminal cells usually pellucid, linear, oblong or rhomboidal, the walls incrassate; upper cells shorter and wider; basal cells linear, the walls thick and porose; alar cells not differentiated. Setae short, smooth; capsules immersed or exerted; annulus absent; operculum conic, with a small oblique beak; exostome teeth papillose; basal membrane of endostome low, the segments linear, stout, perforate, as long as the exostome teeth. Calyptra cucullate to rarely mitrate, with or without hairs. Spores finely papillose.