FIGURE 4 in Tillandsia mantiqueirae (Bromeliaceae), a New Species from Minas Gerais State, Brazil

FIGURE 4. Transversal sections of median leaf portions of T. mantiqueirae (A, C, E, G) and T. nuptialis (B, D, F, H). A–B (adaxial surface). Detail of the single-layered epidermis. A. Cells with "U-shaped" thickening and thin-walled cells in the subepidermic layer characterizing a non-mechanical tissue. B. high degree of thickening of the anticlinal and internal periclinal walls and secondary thickening of the subepidermal cells forming a mechanical layer. C–D (adaxial surface). C. Detail of trichome with single-celled stalk and central cell in disc. D. Detail of trichome with 3-celled stalk and a single central cell in the disc. E–F (abaxial surface). Details of stomata (arrows) and substomatic chambers. G–H. Frontal view of peltate trichomes. Abbr.: ep. epidermis; snml. subepidermal not mechanical layer; sml. subepidermal mechanical layer; *. stalk cells; dcc. disc central cell; sc. substomatic chamber; Scale bars: A–B—10 μm; C–H—5 μm. (Preparations and images by A.R. Guimarães).