Dicranum fuscescens |
|||||
---|---|---|---|---|---|
curly heron's-bill moss, dicranum moss |
|||||
Habit | Plants light green to dark brownish green, dull, in loose tufts. | ||||
Stems | 1–6(–18) cm, tomen-tose to scarcely tomentose with white or reddish brown rhizoids. |
||||
Leaves | falcate-secund, often strongly so, sometimes somewhat sparse, distal leaves curled, proximal leaves with flexuose apices, slightly to strongly curled and crisped when dry, smooth, (3–)4–7(–10) × 0.6–1 mm, concave below, keeled above, from a lanceolate base to a gradually narrowed, fine, keeled subula; margins entire proximally, serrulate to strongly serrate in the distal half, sometimes nearly entire throughout; laminae 1-stratose and usually 2-stratose above on one or both margins, rarely some 2-stratose regions near costa; costa excurrent, 1/6–1/4 the width of the leaves at base, strong, terete, papillose to spinose distally on abaxial surface, occasionally almost smooth, sometimes extending to costa, abaxial ridges absent, with a row of guide cells, 2 well-developed stereid bands extending to distal part of leaf, adaxial epidermal layer of cells not differentiated, abaxial epidermal layer differentiated; cell walls between lamina cells slightly bulging; leaf cells smooth to slightly papillose below on abaxial surface, papillose to spinose prorate above on abaxial surface; alar cells 2-stratose, strongly differentiated, sometimes extending to costa; proximal laminal cells elongate, pitted, (19–)43–62(–93) × (2–)6–8(–12) µm; distal laminal cells irregularly rounded, elliptic, short-rectangular to quadrate, not pitted, (7–)9–23(–36) × (4–)8–12(–14) µm. Sexual condition dioicous; male plants as large as females, growing intermixed, or in separate patches; interior perichaetial leaves abruptly short-acuminate, convolute-sheathing. |
||||
Seta | 1–3.5 cm, solitary, yellow, reddish yellow or brown. |
||||
Capsule | 1–3 mm, arcuate, inclined to horizontal, strumose, strongly furrowed when dry, somewhat contracted below mouth, dark brown to reddish brown; operculum 1–2 mm. |
||||
Spores | 14–24 µm. |
||||
Dicranum fuscescens |
|||||
Distribution | North America; Europe; Asia
|
||||
Discussion | Varieties ca. 7 (2 in the flora). l. Plants small, stems 1–6(–10) cm, usually densely foliate; leaf margins serrulate to strongly serrate in distal half; costa papillose to spinose distally on abaxial surface; distal laminal cells short-rectangular to quadrate, mostly 18–23 µm long; seta mostly shorter than 2.5 cm 15a. Dicranum fuscescens var. fuscescens (Discussion copyrighted by Flora of North America; reprinted with permission.) |
||||
Key |
|
||||
Source | FNA vol. 27, p. 411. | ||||
Parent taxa | Dicranaceae > Dicranum | ||||
Sibling taxa | |||||
Subordinate taxa | |||||
Name authority | Turner: Muscol. Hibern. Spic., 60, plate 5, fig. 1. (1804) | ||||
Web links |