Ceratolejeunea J.B.Jack & Steph.
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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 small to medium-sized, glossy greenish brown to pale brown to dark brown, creeping to ascending or pendent. Branches Lejeunea- type. Stems with hyalodermis; ventral merophyte 2 cells wide. Leaf lobes widely spreading when dry, apex rounded to acute, plane or recurved, margins entire or toothed. Cells in midleaf isodiametrical to subrectangular with walls yellowish to pale brown and middle lamellae brownish, rarely colourless (C. dussiana), uniformly thickened or with elongate, triradiate trigones, cuticle usually smooth, rarely papillose; oil bodies small, finely granular or homogeneous; ocelli present or absent, when present, 1-10 in lower 1/2 of leaf lobe, sometimes in a row, rarely in underleaves. Lobules variable, small to large, with 1 short or long tooth; hyaline papilla proximal; lobules at branches sometimes much enlarged, with reduced lobe, forming a "utricle." Underleaves bifid or undivided, margins entire or toothed, insertion line shallowly curved to deeply arched. Androecia on short, specialized branches, bracteoles limited to base, bracts with hypostatic lobules. Gynoecia with 1-2 pycnolejeuneoid innovations. Perianths with 4(5) keels extended above into narrow, horn-like or bulbous projections (in C. dussiana extended into flat laciniae). Sporophyte lejeuneoid. Vegetative reproduction rare, by caducous leaves