Flora of North America species comparison

1–9 cm, densely tomentose below with reddish brown rhizoids.

1.5–6 cm, densely tomentose with dark brown to red rhizoids.

erect-spreading, flexuose, ± curled at the tips when dry, slightly undulate or rugose, (2–)3.5–4.5(–7) × 0.5–1 mm, concave below, strongly keeled above, oblong-lanceolate, with a broad lanceolate base gradually narrowing to a short-acuminate apex;

margins serrulate in the distal half, involute in central part;

laminae 1-stratose, with a few 2-stratose regions;

costa percurrent to shortly excurrent, 1/10–1/5 the width of the leaves at base, strong, smooth or papillose to toothed above on abaxial surface, abaxial ridges absent, with a row of guide cells, two thick stereid bands extending well into the apex, adaxial epidermal layer of cells not differentiated, the abaxial layer differentiated;

cell walls between lamina cells strongly bulging;

leaf cells papillose above on abaxial surface, sometimes nearly smooth;

alar cells 2-stratose, differentiated, not extending to costa;

proximal laminal cells elongate, pitted, (25–)41–56(–112) × (5–)6–7(–10) µm, abruptly shorter towards the apex;

distal laminal cells quadrate, irregularly angled, rounded or rectangular, not or indistinctly pitted, cell walls unequally thickened, (5–)7–8(–20) × (5–)7–8(–12) µm. Sexual condition pseudomonoicous;

dwarf males on stem rhizoids of female plants;

interior perichaetial leaves abruptly short-acuminate, convolute-sheathing.

straight, erect-spreading, rigid, appressed when dry, smooth, (5–)6–7(–7.5) × 0.4–0.6 mm, most of the leaf tips deciduous and absent, concave proximally, canaliculate distally, from a lanceolate base to a long subula formed by the excurrent costa, apex acute;

margins entire to somewhat serrulate above;

laminae 1-stratose or some 2-stratose regions near costa;

costa excurrent, 1/4–1/3 the width of the leaves at base, smooth or slightly rough above on abaxial surface, abaxial ridges absent, with a row of guide cells, two thin stereid bands (2–3 cells thick), adaxial and abaxial epidermal layers not differentiated or sometimes with a few cells in both layers enlarged;

cell walls between lamina cells slightly bulging;

leaf cells smooth;

alar cells 1-stratose, sometimes with some 2-stratose regions, well-differentiated, sometimes extending to costa;

proximal laminal cells elongate-rectangular, usually pitted or indistinctly pitted, (25–)39–55(–84) × (5–)7–8(–10) µm;

median laminal cells rectangular, not pitted, (11–)21–22(–37) × (4–)7–8(–10) µm;

distal laminal cells nearly elliptic, incrassate.

1–4 cm, solitary, rarely 2 per perichaetium, yellowish.

1.5–2.5 cm, solitary, yellowish to brown.

dioicous;

male plants as tall as females, usually more slender;

interior perichaetial leaves abruptly long-acuminate, convolute-sheathing.

1.5–3 mm, arcuate, inclined to horizontal, furrowed when dry, slightly contracted below the mouth, yellowish brown;

operculum 1.5–2.5 mm.

1.8–2 mm, arcuate to nearly straight, ± erect, smooth, sometimes striate when dry, yellowish brown;

operculum 1–2 mm.

19–26 µm.

16–28 µm.