Little'S Fissidens Moss

Description

Plants to 3 - 2 mm. Stem un-branched and sparingly branched; axillary hyaline nodules absent; central strand absent. Leaves as many as 8 pairs, ligulate, obtuse-apiculate to acute, to 1.5 - 0.25 mm; dorsal lamina narrowed proximally, ending at insertion or slightly decurrent; vaginant laminae 1/2-2/3 leaf length, - equal, minor lamina ending on or near margin; margin crenulate, often irregularly so on vaginant laminae, elimbate; costa ending 3-5 cells before apex, bryoides-type; lamina cells 1-stratose, distinct, mammillose, firm-walled, irregularly quadrate to hexagonal, oblate on margin, 8-10 -m, somewhat larger, - oblong in proximal parts of vaginant laminae. Sexual condition rhizautoicous and gonio-autoicous; perigonia gemmiform and on elongate stems. Sporophytes 1 per perichaetium. Seta 1.4-1.8 mm. Capsule theca exserted, erect, radially symmetric, to 0.5 mm long; peristome teeth anomalous, undivided, papillose; operculum to 0.3 mm. Calyptra cucullate, smooth, 0.3 mm. Spores 8-11 -m. Walls of small pockets in gypsum sinkholes; N.Mex.