Drepanolejeunea
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Authority
Gradstein, S. Robbert & Ilkiu-Borges, Anna L. 2009. Guide to the plants of Central French Guiana. Part 4. Liverworts and hornworts. Mem. New York Bot. Gard. 76 (4): i-iv + 1-140.
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Family
Lejeuneaceae
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Scientific Name
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Description
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Description - Plants very small, light green to pale brown, creeping. Branches Lejeunea-type. Stems of 7 outer cells and 3 inner cells, epidermis cells not or slightly enlarged, no hyalodermis, all cells ± thick-walled; ventral merophyte 2 cells wide. Leaf lobes suberect to rather widely spreading, asymmetrically ovate-triangular to lanceolate, often falcate, with ocelli; apex acute-acuminate, rarely rounded, plane or recurved; margins crenulate to strongly dentate, rarely entire. Cells with or without trigones, cuticle smooth or papillose; oil bodies finely granular; ocelli present, colorless, 2-4(10) in a (broken) row in lower 1/2 of leaf, basal ocellus not conspicuously enlarged. Lobules 1/3-2/3 of leaf length, occasionally reduced, inflated, free margin involute, apical tooth usually 1-celled, long-falcate and sharp, a "preapical" tooth sometimes present at junction of lobule and ventral leaf margin, hyaline papilla proximal. Underleaves small, distant, bifid with very slender, diverging lobes, lamina without border of large cells, insertion line straight; adhesive rhizoid discs present in epiphyllous plants. Androecia on short, specialized branches, bracteoles limited to base, bracts with hypostatic lobules. Gynoecia on short branches, with 1 pycnolejeuneoid innovation. Perianths inflated, 5-keeled above, the keels toothed-winged, often extending into horn-like projections or auricles. Sporophyte lejeuneoid. Vegetative reproduction commonly by caducous branchlets. Eight species are treated here; the record of a further species from Saiil, D. mosenii (Stephani) Bischler (Onraedt & Cremers, 1980), is doubtful and needs confirmation.