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Published In: Species Muscorum Frondosorum 115. 1801. (Sp. Musc. Frond.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

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Acceptance : Accepted
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Discussion: The genus Barbula has lanceolate to lingulate leaves that are often stoutly mucronate, strongly recurved leaf margins, two well-developed costal stereid bands, and long-cylindrical capsules with filamentous, spirally twisted peristome teeth. It is very similar to Didymodon, and indeed the two are sometimes considered synonymous (Smith 1978, Nyholm 1990, Frey & Kürschner 1991, Abramov & Volkova 1998). Saito (1975) distinguished the Japanese members of these genera by axillary hair features and the shape of the surface costal cells on the upper, ventral (adaxial) leaf surface: Barbula all axillary hair cells hyaline, costal cells short-rectangular to elongate; Didymodon basal cells of axillary hairs brown, costal cells quadrate. In Central America the axillary hair character consistently distinguishes the genera, but the shape of the superficial, upper, abaxial costal cells various within the genera. There are three other features that tend to distinguish the two genera. In Barbula the basal and upper leaf cells are usually strongly differentiated, the leaf papillae usually multiplex, and the peristome is usually long and distinctly twisted. In Didymodon the basal and upper leaf cells are usually weakly differentiated, leaf papillae are often absent to simple, and the peristomes are usually short and weakly twisted. Pseudocrossidium is similar to Barbula in leaf shape, in having revolute margins and in having entirely hyaline axillary hairs. It differs from Barbula in having only a single (dorsal) costal stereid band and in having more tightly revolute leaf margins in which the interior marginal cells are enlarged and thin-walled.

 

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Barbula Hedw., Sp. Musc. Frond. 115. 1801, nom. cons.

Hydrogonium (C. Müll.) Jaeg., Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1877-78. 405. 1880. Trichostomum sect. Hydrogonium C. Müll., Linnaea 40: 297. 1876. Didymodon subg. Hydrogonium (C. Müll.) Kindb., Eur. N. Amer. Bryin. 2: 273. 1897. Barbula subg. Hydrogonium (C. Müll.) Fleisch., Musci Buitenzorg 1: 352. 1904.  Barbula sect. Hydrogonium (C. Müll.) Saito, J. Hattori Bot. Lab. 39: 492. 1975.

Semibarbula Herz. ex Hilp., Beih. Bot. Zentralbl. 50: 626. 1933.

Plants small to medium-sized, yellow-green, green, dark-green, red, or brown above, brown to reddish brown below, in loose tufts or cushions. Stems erect, sparsely and irregularly branched, sclerodermis and central strand present; rhizoids reddish brown, sparse. Axillary hairs 5–8 cells long, all cells hyaline. Leaves triangular-, oblong-, or ovate-lanceolate, lanceolate, lingulate, ligulate, appressed-incurved, often twisted and contorted above when dry, deeply grooved along the costa on upper ventral surface; apices rounded to obtusely acute, often mucronate; lamina unistratose; margins entire, at times denticulate at apex, usually recurved, occasionally plane; costa usually percurrent to excurrent as a short mucro, occasionally subpercurrent, ventral superficial cells elongate, occasionally quadrate to short-rectangular, guide cells and two stereid bands well-developed, ventral surface layer of enlarged cells; upper cells quadrate, oblate or short-rectangular, firm-walled, pluripapillose, occasionally smooth, basal cells usually differentiated, enlarged, rectangular, walls thin or firm, at times porose, bulging, or short- to long-rectangular, hyaline, usually smooth, alar cells not differentiated. Asexual reproduction by propagula on rhizoids or in leaf axils. Perichaetia terminal. Dioicous. Setae elongate, smooth. Capsules long-cylindrical; stomata in neck; opercula long conic; annuli well-developed; peristome teeth 32, filamentous, twisted counter-clockwise, basal membrane low. Calyptrae cucullate.

 

 
 
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