Fissidens asplenioides Hedw.

Plants to 250 × 4 mm. Stem unbranched and sparingly branched; axillary hyaline nodules weak; central strand present. Leaves in as many as 25 pairs, often undulate, mostly lingulate, rounded to obtuse to broadly acute, sometimes apiculate, to 4 × 0.5 mm; dorsal lamina narrowed proximally, ending before or at insertion, not decurrent; vaginant laminae 1/2-3/4 the leaf length, unequal, minor lamina of most leaves rounded and free distally, or narrowed distally and ending on or near costa; margin ± entire to crenulate-serrulate, sometimes unevenly so distally, elimbate except for a weak limbidium in the proximal parts of vaginant laminae, limbidial cells 1-stratose; costa ending several cells before apex, oblongifolius-type, distal part of leaf in transverse section showing enlarged cells arranged in a single row; laminal cells of dorsal and ventral laminae 1-stratose, distinct, smooth, lenticularly thickened but appearing bulging, firm-walled, irregularly hexagonal, 7-12 µm long; juxtacostal and interior proximal cells of vaginant laminae 1-stratose, smooth, plane, quadrate to ± oblong, larger; medial marginal cells of vaginant laminae ± elongate, oriented obliquely. Sexual condition dioicous; perigonia and perichaetia on elongate stems; naked archegonia at times in axils of distal leaves. Sporophytes 1-2 per perichaetium, orange-red. Seta to 6 mm. Capsule theca ± erect, radially symmetric to slightly arcuate, bilaterally symmetric, to 1.5 mm; peristome taxifolius-type; operculum ± as long as theca. Calyptra cucullate, smooth, 1-1.7 µm. Spores 7.5-12 µm.