FIGURE 4 in Begonia isadorae (Begoniaceae), a new endemic species from Ilha Grande, an island in southeastern Brazil, with notes on leaf anatomy

FIGURE 4. Leaf blade anatomy of Begonia isadorae (Begoniaceae). A. Frontal view of epidermis (Ep) on the adaxial surface showing common cells and glandular trichomes (Gt). Inset shows cross section of glandular trichome occurring sunken on the epidermis. B. Frontal view of epidermis (Ep) on the abaxial surface showing glandular trichomes (Gt) and stomata (St) in groups of two or three. C. Frontal view of epidermis (Ep) on the midrib region showing lines of druses (Dr), emergences forming simple trichomes (Tr) and glandular trichomes (Gt). Inset shows detail of simple trichome. D. Cross section showing unistratified epidermis (Ep) on both sides with emergences forming simple trichomes (Tr), wide layer of hypodermis on both sides, and thin chlorophyll parenchyma (Cp). E. Midrib showing unistratified epidermis (Ep), wide hypodermis (Hp), collenchyma (Co), a continuous layer of chlorophyll parenchyma, formed by spongy (Sp) and palisade (Pp) parenchyma, and two collateral vascular bundles facing each other immerse in a fundamental parenchyma (Fp) with druses (Dr). Fi: fibers, Ph: phloem, Xy: xylem. F. Detail showing the leaf blade with wide hypodermis (Hp), tiny palisade parenchyma (Pp) and spongy parenchyma (Sp) with idioblast (Id). G. Detail of idioblast (Id) submitted to Sudan III test, showing suberized cell walls. H. Emergence forming a simple trichome with tapered apex. Scale bars: A, B, C, H = 50 µm; D = 200 µm; E, F, G = 100 µm.