Monographs Details: Austinia
Authority: Sharp, Aaron J., et al. 1994. The Moss Flora of Mexico. Part Two: Orthotrichales to Polytrichales. Mem. New York Bot. Gard. 69 (2)
Description:Genus Description - Plants small and slender in compact, green, somewhat shiny mats. Stems in section 8-10 cells across, with all thick-walled, with no cortical or medullary differentiation; branches horizontal, elongate, subterete; rhizoids slightly roughened. Leaves erect to erect-spreading wet or dry, slightly concave, ovate-lanceolate, short- to long-acuminate, shortly decurrent; margins plane, serrulate above and serrulate-crenulate below except at the extreme base (for a distance of 2-3 cells); costa slender, ending slightly below the midleaf or sometimes very weak and variable in length, smooth or papillose at the upper ends of cells; upper cells rhombic to oblong-hexagonal, 2-5:1, smooth, with primordial utricles conspicuous on drying; alar cells gradually differentiated, subquadrate in groups not extending inward as far as the costa, with 1-2 elongate cells forming decurrencies. Autoicous. Perichaetial leaves lance-acuminate; margins plane, serrulate above or nearly to the base; costa lacking or single; cells oblong-hexagonal to oblong-rhomboidal (2-6:1), smooth. Setae elongate, reddish-brown, smooth; capsules short-cylindric, reddish-brown, usually with a short but distinct neck; annulus none; operculum conic to rostrate, light-yellow; exothecial cells quadrate to rectangular, with walls straight or more or less wavy especially near the mouth; peristome attached at the mouth, consisting of 16 endostome segments scarcely or not at all keeled, perforate at the middle, occasionally bifid at the apex, colorless and seemingly smooth but proving, on close scrutiny, to be densely covered by low, blunt papillae. Spores sparsely but distinctly papillose. Calyptrae slightly roughened above, sometimes bearing a few upright hairs.
Austinia is a monotypic genus of questionable value; it is little more than a very small expression of Helicodontium with a reduced costa and a peristome consisting of endostome only.