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BFNA Title: Ceratolejeunea |
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WORK IN PROGRESS: 10. CERATOLEJEUNEA (Spruce) Schiffner in Engler & Prantl, Nat. Pflanzenfam. 1(3): 118, 125. 1893 (preprint), 1895 · [Greek keras, horn, and Lejeunea, the name of a related genus]. Lejeunea subg. Ceratolejeunea Spruce, Trans. & Proc. Bot. Soc. Edinburgh 15: 198. 1885. Plants ca. 1 mm wide, forming prostrate mats; specialized asexual reproduction absent. Stem cross section with 7 epidermal and 10--20 medullary cells. Leaves widely spreading, ovate to ovate-falcate; cell walls brown; ocelli usually present. Lobules ovoid, strongly inflated, sometimes utriculate at branch base, free margin with 1 single-celled, often falcate tooth, hyaline papilla at its proximal base. Underleaves orbiculate, 2-lobed to ca. 1/2 underleaf length, lobes erect, triangular to hemispheric. Autoicous or dioicous. Androecia usually on short branches composed exclusively of bracts. Gynoecial innovations 1--2, leaf sequence beginning with underleaf. Perianth with 4 keels forming shoulderlike crests or terete horns that extend beyond apex of perianth. Species ca. 50 (3 in the flora): pantropical, with greatest diversity in neotropics. Ceratolejeunea is generally easily distinguished from other Lejeuneaceae subfamily Lejeuneoideae by the dark pigmentation of the plants, utriculate lobules, and the horned perianths, although not all species possess all of these features. R. M. Schuster (1984) recognized three subgenera (Ceratolejeunea, Ceratophora, and Caducifolia). All of the North American species belong to subgenus Ceratolejeunea. SELECTED REFERENCES Fulford, M. 1944. Studies on American Hepaticae--VI. Ceratolejeunea. Brittonia 5: 368--403. Schuster, R. M. 1980. Ceratolejeunea. In: R. M. Schuster. 1966--1993. Hepaticae and Anthocerotae of North America. New York. Vol. 4, pp. 909--929.
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