Flora of North America species comparison

1.5–3 cm, 0.8–1 mm thick when dry, profusely branched, irregularly pinnate, primary branches prostrate to arcuate, mostly attenuate, secondary branches attenuate at apices;

central strand cells not differentiated;

pseudoparaphyllia absent;

rhizoids somewhat abundant.

0.5–1.5 cm, 0.3–0.5 mm thick when dry, rarely branched, primary branches prostrate;

central strand cells not differentiated;

pseudoparaphyllia absent;

rhizoids few.

appressed when dry, complanate when moist, ligulate, slightly narrowed mid leaf, 1.2–2(–2.2) mm;

base broadly decurrent;

margins plane, entire from base to apex (cells moderately mammillose at insertion), sometimes denticulate near apex;

apex acute, sometimes obtuse or slightly apiculate, intact;

costa strong, sharply ending a few cells before apex, sometimes fading in youngest leaves, not obscured by laminal cells distally, pellucid, abaxial costa cells smooth;

basal laminal cells hyaline or sometimes chlorophyllose, papillae few, region sometimes extending more than 1/2 length of leaf base;

distal cells quadrate, 6–8 µm, papillae many, branched.

julaceous when dry, spreading, not complanate when moist, delicate, narrowly ligulate to tapering, 0.5–0.9 mm;

base narrowly decurrent;

margins plane, crenulate toward apex by prominent papillae;

apex narrowly obtuse to acuminate, often broken off;

costa weak, ending before mid leaf, obscured by laminal cells almost throughout, pellucid proximally, abaxial costa cells smooth;

basal laminal cells few, pellucid, smooth, region not reaching margin;

medial cells round, 4 µm, papillae many, unbranched.

1–1.5 cm.

oblong, urn 1.6–2.8 mm;

stomata at base;

annulus not differentiated;

operculum obliquely short-rostrate, 1.3 mm;

exostome teeth irregular, 0.3 mm, striolate proximally, trabeculate and ± finely papillose towards apex;

endostome basal membrane 3 or 4 cells high, segments well developed.

10–13 µm, densely papillose.

never beyond last branching points, leaves abruptly narrowed, costa to beyond mid leaf, ending near apex in most interior leaves, laminal cells smooth.

rare, on terminal branches, leaves oblong, apex acuminate, laminal cells with 1 or 2 papillae per lumen.

unknown.