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Moss China | Family List | Moss China V. 1 | Dicranaceae | Dicranum

1. Dicranum assamicum Dix., J. Bombay Nat. Hist. Soc. 39: 774. 1937.


Plants coarse, fairly robust, caespitose, up to 8 cm high, green to deeply brownish green, shiny, in dense tufts. Stems erect or ascending, simple or branched, homomallous. Leaves falcate-secund when dry, erect-patent when moist, narrowly lanceolate, up to 9 mm long, gradually narrowed from a somewhat sheathing base to a canaliculate or keeled subula; margins plane or slightly incurved, entire below, serrate in the upper third; costa slender, light brownish, percurrent, serrate at back above; median to upper cells elongate, rhomboidal, 45–55 µm × 8–10 µm, relatively thin-walled, not porose, spinosely projecting at the margins; basal cells rectangular, 75–85 µm × 12–16 µm, thick-walled, porose; alar cells quadrate to short-rectangular, tristratose, reddish brown. Dioicous. Perichaetial leaves shorter than the upper stem leaves, cylindrically clasping at base, abruptly narrowed to a short subula. Setae single, straight, yellowish, ca. 2.7 cm long; capsules erect, short-cylindric, ca. 4.7 mm × 1 mm, yellowish brown; opercula long-rostrate, ca. 0.3 mm long; peristome teeth ca. 0.48 mm long, divided to the middle, smooth above, usually perforate and transversely barred below, without vertical striation. Spores 20–23 µm in diameter, papillose, brownish.

Type. India: Naga Hills, Bor 333.

Chinese specimens examind: SICHUAN: Dao-cheng Co., M.-Z. Wang 8142625 (IFSBH, PE); Mu-li Co., C. Gao 20317 (IFSBH). XIZANG: Cha-yu Co., M.-Z. Wang 12759(b) (IFSBH, PE); Mi-lin Co., Y.-G. Su 5201 (KUN).

Habitat: on soil, bases of trees or rotten wood; Distribution: China and India.

Illustrations: Pl. 40, figs. 1–10.


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