Fissidens aciphyllus Dixon

Plants small, scattered, light green; terricolous. Stems 3-4 mm tall, simple; in section subround, central strand present, cortical cells lax, outer row smaller, incrassate. Leaves larger above, little altered dry; ± asymmetrical, ovate-lanceolate to lanceolate or narrowly elliptical, 1.0-2.0 mm long; apex short-acuminate; margins entire, limbate on all laminae, broader on vaginant lamina; costa percurrent to short-excurrent. Vaginant laminae extending to mid-leaf, termination of one blade laminal; dorsal lamina narrowing proximally to insertion. Laminal cells large, lax, hexagonal to elongate-hexagonal, 30-45 µm long, 12-17 µm wide, flat, smooth; basal cells of vaginant laminae rectangular. Perichaetia terminal; leaves undifferentiated. Seta 2.5 mm long, yellowish; capsules erect, urn short-cylindrical, 0.6 mm long; exothecial cells rectangular, weakly thickened; operculum rostrate, 0.4 mm long; capsules immature, therefore other structures not seen.