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

29. Rhabdoweisia Bruch & Schimp., Bryol. Eur. 1: 95 (fasc. 33–36. Mon. 1). 1846.


Plants minute to small, dull green or yellowish green, in dense tufts. Stems erect, simple or branched, somewhat radiculose at base; central strand absent or present. Leaves strongly crispate when dry, erect to erect-spreading when moist, lanceolate to oblong-lanceolate or narrowly lingulate, somewhat keeled, acute or obtuse at the apex; margins usually recurved on one side below, serrulate to serrate above; costa narrow, subpercurrent to percurrent, with well developed guide cells and a dorsal stereid band in transverse section, ventral stereid band poorly developed or absent; upper cells subquadrate or irregularly hexagonal, usually broader than long, smooth; lower cells rectangular, hyaline or pale brown, lax and thin-walled; alar cells not much differentiated. Autoicous. Setae elongate, upper part twisted when dry, straight when moist, yellowish; capsules exserted, erect, symmetric, ovoid to short-cylindric, slightly contracted below the mouth, deeply 8-ribbed when dry; opercula strongly obliquely long-rostrate, nearly as long as the urns; annuli none; stomata present; peristome teeth 16, inserted slightly below the mouth, slender and irregular, undivided, with a low basal membrane, smooth or faintly and irregularly striolate. Calyptrae cucullate, smooth, entire at the base. Spores spherical, brownish, densely papillose.

Index Muscorum (Wijk et al. 1967) listed eight species and several varieties of Rhabdoweisia from the world. Only four species were retained by Lawton (1961) in a revision of the genus Rhabdoweisia, in which the author placed R. sinensis in the synonymy of R. denticulata (= R. crispata) and R. laevidens in the synonymy of R. crenulata. Lawton (1961) did not consider the striolation of peristome teeth as a stable character, because she observed some mature capsules with intermediate stages of peristome teeth between smooth and striolate. However, four species in China are very distinctive in their gametophytes and sporophytes.

1 Peristome teeth distinctly striolate   (2)
+ Peristome teeth smooth or nearly so   (3)
2 (1) Leaf base not clearly narrower, the upper part gradually narrowed from the middle; margins serrate   1 Rhabdoweisia crenulata
+ Leaf base clearly narrower, the upper part rather abruptly narrowed from the middle; margins entire or serrulate   4 Rhabdoweisia sinensis
3 (1) Central strand of stems present; leaves narrowly lanceolate to linear-lingulate; leaf margins entire or serrulate only near the apex   2 Rhabdoweisia crispata
+ Central strand of stems absent; leaves oblong-lanceolate to narrowly lingulate; leaf margins serrate above the middle   3 Rhabdoweisia laevidens

Lower Taxa


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