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BFNA | Family List | BFNA Vol. 1 | Dicranaceae | Dicranum

Dicranum fuscescens Turner, Muscol. Hibern. Spic. 60. 1804.

  • Dicranum fuscescens var. congestum (Bridel) Husnot
  • Dicranum sulcatum Kindberg

    Plants light green to dark brownish green, dull, in loose tufts. Stems 1--6 (--18) cm, tomentose 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 lacking, with a row of guide cells, two 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.

    Varieties 2 in the flora.

    1 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.   Dicranum fuscescens var. fuscescens
    + Plants large, stems 8--18 cm, sparsely foliate; leaf margins nearly entire; costa almost smooth on abaxial surface; distal laminal cells irregularly rounded, elliptic or short- rectangular, mostly 9-19 µm long; seta usually 2.5 cm long or more.   Dicranum fuscescens var. flexicaule

    Lower Taxa

    Related Synonym(s):


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