Hyophila

	Taxon	Illustrator ⠉
	Hyophila involuta	Patricia M. Eckel

Plants turf-forming, sometimes loosely cespitose, dull, green distally, red to reddish-brown or dark green proximally. Stem erect, rarely branched, to 1 cm, hyalodermis absent or weakly present and thin-walled, sclerodermis usually present, central cylinder of thick-walled cells, central strand usually strong; radiculose; axillary hairs 6–10 cells long, hyaline. Leaves tubulose-twisted, incurved, sometimes contorted when dry, spreading when moist, commonly spathulate or ligulate, ovate, oblongelliptic, usually constricted at the base; distal lamina broadly channeled, occasionally concave, shallowly grooved along the costa; base not different in shape; margins plane to broadly incurved, sometimes narrowly recurved in proximal 2/3, entire or denticulate to dentate in distal 1/4 or at the apex; apex broadly acute to rounded, rarely cucullate or emarginate; costa subpercurrent or percurrent, ending in an apiculus or mucro, adaxial surface cells quadrate to shortrectangular, adaxial and abaxial epidermis present, stereid bands 2, guide cells 4 (–6) in one layer; hydroid strand sometimes present; basal-cells differentiated across the leaf to only in the median basal region, usually only in a small area near the insertion; distal cells roundedquadrate to hexagonal, small, walls evenly thickened, bulging equally on both sides or bulging adaxially and plane abaxially, papillae absent or simple. Specialized asexual reproduction by axillary gemmae, these clavate, stellate or dentate-elliptic in the leaf-axils on densely-branched stalks. Sexual condition dioicous or monoicous; perigonia terminal on perigoniate plants or as lateral buds on perichaetiate plants; perichaetia terminal, perichaetial leaves similar to or smaller than cauline leaves. Seta elongate. Capsule long-ovoid to cylindric, operculum conic to long-conic or rostrate, peristome teeth absent. Calyptra cucullate. Spores 7–10 µm, papillose.