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Published In: Bryologia Europaea 4: 69 (Fasc. 23–24. Monogr. 3). 1844. (Bryol. Eur.) Name publication detail

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Acceptance : Accepted
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The leaves of O. pellucens are long and narrow, but not linear-setaceous as in those of O. gracile, and with some experience the two species can be separated on this feature alone. Orthodontium gracile further differs from O. gracile in having smooth to faintly wrinkled capsules, an autoicous sexual condition, costal stereids, and a stem central strand. Capsule shape and setae length are extremely variable features of  O. pellucens and at times plants from single collections exhibit the full range of variation.

The type locality of O. pellucens “Surrucucho, near Cuenca” was originally reported as “Columbia”, but this locality is in Ecuador (Acosta-Solis 1968).

Illustrations: Bartram (1949, Fig. 69 D–F); Meijer (1951, Pl. 14); Crum and Anderson (1981, Fig. 230); Sharp et al. (1994, Fig. 395); Churchill and Linares (1995, Fig. 28 f–j). Figure 159 F–K.
Habitat: On rotting or charred wood (Pinus, Colpothrinax), tree bases, and rocks; 1000–2550 m.
Distribution in Central America: GUATEMALA. Quezaltenango: Steyermark 34642 (F). HONDURAS. Comayagua: Allen 13850 (MO); Cortés: Allen 14361 (MO, TEFH); Lempira Allen 12193 (MO, TEFH). COSTA RICA. Alajuela: Crosby 10011 (CR, MO); Cartago: Alfaro 22 (F); Heredia: Gómez 20057 (MO); Puntarenas: Crosby 9960 (CR, MO); San José: Crosby 9827 (MO). PANAMA. Panamá: Mori & Kallunki 3621 (MO, PMA).
World Range: Southwestern and Southeastern U.S.A.; Mexico; Central America; Caribbean, Western and Northern South America, Brazil; Southwestern Europe; North-Central Pacific.


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Orthodontium pellucens (Hook.) Bruch & Schimp ex C. Müll., Syn. Musc. Frond. 1: 240. 1849.

Bryum pellucens Hook., Icon. Pl. 1: 34. 1837. Apalodium pellucens (Hook.) Mitt., J. Linn. Soc., Bot. 12: 238. 1869. Protologue: “Columbia” [Ecuador]. In caves, Surrucucho, near Cuenca, Columbia. Prof. Jameson.  

Plants small, yellowish green in tufts to 8 mm high; rhizoids moderately developed at base. Stem central strand present. Leaves 2–4 mm long, erect to erect-flexuose, twisted when dry, linear-lanceolate; apices acute to shortly acuminate; margins plane or weakly recurved below, not bordered, entire below, weakly serrulate above; costae percurrent, with stereid cells; upper cells linear-rhomboidal to linear‑fusiform, firm‑walled, 90–170 x 6–20 μm, basal cells reddish, enlarged, quadrate to oblong, thin-walled and bulging, alar cells not differentiated. Autoicous. Perigonia just below the perichaetia. Setae 5–17 mm long, yellowish. Capsules 1–3 mm long, oblong, oblong-cylindrical to sub-cylindrical, erect, furrowed to sulcate when dry, constricted at neck, bordered at mouth by 3–4 rows of oblate cells; opercula conic-rostrate, 0.75 mm long; peristome inserted within mouth, exostome yellow-orange, smooth, endostome nearly as long as the exostome teeth, yellow, smooth, basal membrane low, segments stout, not perforate or keeled, cilia absent. Spores 16–20 μm, densely papillose to warty. Calyptrae cucullate, 2 mm long.



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