Philonotis Brid., Bryol. Univ. 2: 15. 1827.
Bartramidula Bruch & Schimp. in B.S.G., Bryol. Eur. 4: 55. 1846.
Plants small, delicate to medium, or robust, green, yellow-green, or glaucous, dull or shiny. Stems mostly erect to loosely ascending, sometimes prostrate, hyalodermis and central strand present, branching sparse and irregular, or with subfloral whorls, moderately to heavily tomentose; rhizoids smooth to lightly papillose. Leaves appressed, erect, erect-spreading or wide-spreading, straight or secund, closely or distantly spaced, lanceolate, ovate-lanceolate, narrowly triangular-lanceolate, or oblong-lanceolate; margins narrowly revolute or plane, sharply or bluntly toothed; costa subpercurrent, percurrent, short- or long-excurrent; upper cells quadrate to linear, papillose or smooth, papillae usually projecting from the upper ends, occasionally from the lower ends or central, basal cells rectangular to quadrate, papillose over the upper ends, lower ends, or smooth, alar cells quadrate to rectangular. Dioicous, autoicous, or synoicous. Perigonia gemmiform or discoid. Perichaetial leaves larger and longer-pointed than vegetative leaves. Setae elongate. Capsules ovoid to subglobose, erect or inclined, furrowed, rugose or smooth when dry; exothecial cells short, thick- or thin-walled; stomata numerous at base; opercula conic to conic-mammillate; peristome absent, rudimentary or double, exostome teeth 16, narrowly triangular, dorsal surface finely papillose below, coarsely papillose near tips, trabeculae thin, ventral surface smooth, trabeculae at base very thick, endostome segments nearly as long as the exostome, yellowish, finely papillose granulose below, each segment split along the median line and each half diverging toward the cilia, cilia 3-4, well-developed. Spores ovoid or subreniform, papillose.