Monographs Details: Fissidens stenopteryx Besch.
Description:Species Description - Plants dark green. Stems monomorphic, unbranched to profusely branched, to 12 mm [1.2 cm] long x 1.5 mm wide; rhizoids basal and axillary, smooth, reddish; axillary hyaline nodules absent; epidermis and outer 1-2 tiers of cortical cells small, incrassate, pigmented; inner cortical cells larger, thin-walled, hyaline; central strand absent; multicellular, ± filiform gemmae often borne on axillary rhizoids. Leaves crispate, somewhat inrolled from tips when dry, loosely imbricate, as many as 30 pairs, lanceolate, acute, often ending in a clear apical cell, to 1.4 mm long x 0.3 mm wide, perichaetial leaves the largest; margin entire to serrulate, limbate on proximal 1/2 or less of vaginant laminae of perichaetial leaves, limbidium weak, limbidial cells unistratose; costa ending 2-4 cells below leaf apex to percurrent, bryoides type; dorsal lamina narrowed, usually ending far above insertion; vaginant laminae of cauline leaves ± 2/3 leaf length, acute, ± unequal, minor lamina usually ending close to margin; laminal cells obscure, eguttulate, unistratose, firm-walled, pluripapillose, rounded-hexagonal, 7-8 p,m long, in transverse section twice as deep as wide. Monoicous (gonioautoicous, rhizautoicous); perigonia gemmiform, axillary or terminal on stems as long on nearly as long as perichaetial stems; perichaetia terminal on stems and branches. Sporophytes 1 per perichaetium, yellow, darkening with age; seta smooth, to 1.3 mm long; theca exserted, erect, radially symmetric, to 0.7 mm long, stomatose, exothecial cells quadrate to oblong, collenchymatous; peristome scariosus type; operculum conic, short-rostrate, to 0.3 mm long. Spores smooth, 15-20 µm diam. Calyptra cucullate, smooth, 0.3 mm long.
Discussion:Fissidens stenopteryx is distinguished from other pluripapillose species in subgenus Aloma by its narrow leaves, and narrow dorsal lamina that ends far above the leaf insertion. The limbidium is difficult to demonstrate in some specimens.
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