Pleuridium nervosum (Hook.) Mitt.

Plants small, in scattered groups, yellowish green; terricolous. Stems erect, julaceous, to 3 mm tall, simple; in section with small central strand, cortical cells incrassate, margin lobed. Leaves imbricate, lower leaves ovate to oval, 0.4-0.8 mm long, upper leaves oblong, to 1.2 mm long; apex obtuse to acute in lower leaves, gradually longer pointed to acuminate in upper leaves; margins irregularly serrate by projecting upper and/or lower cell ends. Costa percurrent in lower leaves, filling acumen in upper leaves; in section guide cells 5-8, large, ventrally exposed, dorsal stereid band small, dorsal surface cells large, strongly incrassate. Upper laminal cells of lower leaves subquadrate to short-rectangular becoming rhombic to rhomboidal in subperichaetial leaves; basal cells quadrate to rectangular in all leaves. Autoicous. Perichaetial leaves broadly oval, abruptly short-acuminate, 2.2-2.5 mm long; margins serrulate at shoulders; costa percurrent; laminal cells rhombic to rhomboidal; marginal cells generally narrower, basal cells rectangular. Seta short, to 0.4 mm long; capsule immersed, urn oval to elliptical, 0.8 mm long, blackish red to yellowish red, obtuse to very shortly beaked, exothecial cells longitudinally short-rectangular; calyptra cucullate; spores round to triangular, 20-25 µm, papillose.