Flora of North America species comparison

0.2–1 cm, strongly rounded julaceous or sometimes gemmiform.

sometimes julaceous, unbranched to sparsely branched by subfloral innovations, stolons absent (present in Rhodobryum);

rhizoids few to many, color various, smooth to papillose, micronemata and/or macronemata often present.

erect when moist, ovate to ovate-lanceolate, somewhat concave, 0.3–1(–1.2) mm;

base green;

margins rarely recurved proximally or plane distally;

apex broadly rounded to acute, not cucullate, hyaline in distal 1/4–1/2 of leaf or rarely nearly entirely green;

costa not reaching apex, apiculus present, sometimes short or nearly absent, hyaline, irregularly incurved when dry;

proximal laminal cells quadrate or short-rectangular, 12–18 µm wide, 1–2:1;

distal cells short- or elongate-hexagonal, (30–)40–80 × 10–15 µm, (1–)3–5:1, walls thin or somewhat thickened, not distinctly incrassate.

imbricate to variously contorted or twisted when dry, erect to erect-spreading when moist, broadly lanceolate, ovate, ovate-lanceolate, obovate, or spathulate;

base straight or curved at insertion, decurrent or not;

margins plane, recurved, or revolute, 1- or 2-stratose, rarely multistratose, limbidium present or absent;

apex broadly rounded to acute or acuminate;

costa percurrent, subpercurrent, or short- to long-excurrent, apiculus sometimes present when costa ends before apex, stereid band 1, well developed or occasionally greatly reduced, guide cells present or absent, adaxial supracostal cells irregularly to regularly quadrate or short- to long-rectangular proximally;

alar cells usually similar to juxtacostal cells, sometimes quadrate, region small, differentiated;

laminal cells relatively uniform or obscurely to distinctly heterogeneous;

proximal cells usually quadrate, short- or long-rectangular, shape often distinctly different, occasionally similar to medial and distal cells;

medial cells usually similar to distal cells;

distal cells short to very long, hexagonal to rhomboidal, sometimes vermicular, 2–10:1, sometimes occurring in rows oblique to costa, walls thin to thick, sometimes pitted.

brown to red-brown, 1–2 cm.

single, sometimes multiple, color various, elongate.

dioicous or monoicous, sometimes polyoicous;

perigonia and perichaetia terminal or lateral;

perichaetial leaves same size as vegetative leaves or usually larger, sometimes forming rosette, inner leaves usually highly differentiated, often narrower, costa weaker.

red to red-brown, ovate, 2–3 mm;

hypophysis differentiated, somewhat thickened.

erect, inclined, or nutant, long-exserted, ovate, spheric, cylindric, or pyriform, occasionally zygomorphic, 1–14 mm;

hypophysis well differentiated or not, sometimes inflated and rugose;

exothecial cells near mouth quadrate or short-rectangular, often reddish, walls thick, in 1–3+ rows, medial cells longer, short- to long-rectangular, walls straight or sinuate;

annulus usually present, revoluble;

operculum convex, short- to long-conic, sometimes rostrate;

peristome diplolepidous-alternate, rarely reduced to 1 layer or absent;

exostome white, pale yellow, or tan, sometimes reddish, teeth triangular to lanceolate, small pores sometimes present along fissural line;

endostome hyaline to pale yellow, separate or sometimes adherent to exostome, basal membrane low to high, segments narrow to wide, usually broadly perforate, cilia usually appendiculate, to variously reduced in number or length or sometimes absent.

fugacious, cucullate, small, smooth.

8–15 µm.

shed singly or as tetrads, rarely germinating in capsule, smooth to papillose, pale yellow, tan, or nearly hyaline, rarely darker.

asexual reproduction by leaf axil bulbils, leafy, small.

asexual reproduction common, of 7 distinct types: spheric to ovoid rhizoidal tubers, filiform rhizoidal or leaf axil gemmae, leaf axil bulbils, stem tubers, slender leafless terminal shoots, or leaf axil deciduous brood branchlets.