Flora of North America species comparison

2 cm, 0.5–2 mm wide, ascending to erect.

and branch leaves similar, spreading to squarrose, not undulate, ovate or lanceolate, not or weakly plicate;

base decurrent or not;

margins plane, serrulate to serrate (serrulate to entire in H. adscendens);

apex acuminate to long-acuminate;

costa double and short or rarely ecostate;

alar cells usually clearly differentiated, few quadrate, rectangular, or abruptly inflated, rounded cells present;

laminal cells smooth.

loosely imbricate to somewhat spreading, often squarrose, sometimes squarrose-recurved, usually straight at stem and branch apices, not plicate, 0.6–2 × 0.3–0.8 mm;

base distinctly decurrent;

margins serrulate to strongly serrate;

alar cells rounded to oval, abruptly inflated, 14–65 × 14–24 µm, hyaline, sometimes orange to red;

basal laminal cell walls pitted, sometimes pitted to mid leaf or beyond;

medial cells 24–50 × 4–7 µm. Sexual condition autoicous.

light brown to red, 0.9–2 cm.

light brown to red or yellowish.

autoicous or dioicous;

perichaetial leaves ovate-lanceolate, apex gradually acuminate, acumen occasionally filiform.

inclined to nearly erect, light brown, oblong to cylindric, slightly arcuate to straight, 1–2 × 0.3–0.5 mm, not or little contracted below mouth when dry;

operculum conic to conic-apiculate, 0.3–0.4 mm.

erect to inclined, oblong or cylindric, straight to arcuate, often contracted below mouth when dry;

annulus 2- or 3-seriate, deciduous, cells large;

operculum conic to conic-apiculate;

peristome double;

exostome teeth with external surface cross striolate proximally, papillose distally;

endostome basal membrane high, segments narrow, keeled, cilia 1–3, approximately same length as segments, sometimes absent.

naked.

10–15 µm.

spheric to ovoid, minutely papillose.

asexual reproduction absent.