Flora of North America species comparison

leaves ovate or ovate-lanceolate, gradually or sometimes abruptly narrowed to apex, ± suddenly curved distally, concave, 0.5–1 mm wide;

apex acuminate or long-acuminate, sometimes apiculate;

costa single, ending beyond mid leaf;

alar cells 2–10;

medial laminal cells (shorter 1/2 of leaf) 61–140(–179) µm, cell ends short or long fusiform-narrowed, rarely rounded to almost square.

leaves ovate-lanceolate to broadly ovate, sometimes almost orbicular, gradually or abruptly narrowed to apex, suddenly curved distally, sometimes indistinctly so or ± straight, concave or strongly concave, not or hardly plicate;

base not or hardly decurrent;

margins entire proximally, finely denticulate or ± entire near apex;

apex obtuse, apiculate, acute, or acuminate;

costa single or double, short or ending beyond mid leaf, rarely ecostate;

alar cells differentiated, few, short- to long-rectangular, strongly inflated, hyaline, walls thin, region distinctly delimited, small, transversely triangular, from margins at most 50% distance to costa;

medial laminal cell walls thin to strongly incrassate, porose or not.

autoicous.

dioicous or autoicous;

inner perichaetial leaves plicate;

vaginula with paraphyses present.

with exostome external surface more than 40–50% cross striolate basally.

with annulus separating;

exostome external surface reticulate or partly, rarely entirely, cross striolate basally, margins slightly dentate distally.

12–21 µm.