Flora of North America species comparison

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

2–8 cm, tomentose with reddish brown 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 or nearly so, spreading, little changed when dry, smooth, 3–5.5 × 0.6–1.2 mm, concave or tubulose proximally, tubulose to slightly keeled above; ovate-lanceolate, apex obtusely acute;

margins serrate near apex;

laminae 1-stratose;

costa subpercurrent to percurrent, 1/10–1/8 the width of the leaves at base, smooth or weakly toothed on abaxial surface near apex, with a row of guide cells, two weak stereid bands, at least in basal part of leaf, adaxial and abaxial epidermal layers of cells not differentiated;

cell walls between lamina cells not bulging;

leaf cells smooth;

alar cells 1- or 2-stratose in part, differentiated, not extending to costa;

proximal laminal cells linear-rectangular, pitted, (45–)65–120(–150) × (13–)16–17(–19) µm;

distal laminal cells shorter, narrow, pitted or with few pits, (20–)30–45(–60) × (5–)8–10(–13) µm. Sexual condition dioicous;

male plants about as large as the female or slightly smaller;

interior perichaetial leaves ± abruptly acuminate, convolute-sheathing.

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

1.5–3 cm, solitary, rarely two per perichaetium, yellow to reddish brown.

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

operculum 1.5–2.5 mm.

1.5–4 mm, erect, straight or nearly so, furrowed when dry, brown;

operculum 1.6–2.8 mm.

19–26 µm.

13–19 µm.