Rosemary leaf cross section (Rosmarinus officinalis), SEM

Rosemary leaf cross section (Rosmarinus officinalis), SEM

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Credit: DENNIS KUNKEL MICROSCOPY/SCIENCE PHOTO LIBRARY

Caption: Rosemary leaf cross section (Rosmarinus officinalis), coloured scanning electron micrograph (SEM). A thin waxy cuticle is present on the upper and lower surface of the leaf. The rectangular line of cells near top of the leaf (right below the cuticle) is the leaf epidermis containing epidermal cells (without chloroplasts). The cuticle and epidermis helps to protect the leaf. The leaf interior contains mesophyll parenchyma cells that consist of two types 1) palisade mesophyll, oblong cells near the upper epidermis arranged perpendicular to the epidermal cells and 2) spongy mesophyll, (not visible in this image). The packed palisade mesophyll cells contain chloroplasts that are the major leaf sites for photosynthesis. The spongy mesophyll cells are loosely packed, with few chloroplasts and are more involved with gas exchange. Magnification: x220 when shortest axis printed at 25 millimetres.

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Keywords: 28363e, asterid, asterids, cell wall, cellulose wall, colored, coloured, false-colored, false-coloured, herb, herb leaf, lamiaceae, lamiales, leaf, leaf parenchyma, leaf surface, palisade mesophyll, parenchyma cell, photosynthesis, plant, plant cell, plant cuticle, plant epidermal cell, plant epidermis, plant leaf, plants, rosemary, rosemary leaf, rosemary plant, rosmarinus, rosmarinus officinalis, scanning electron micrograph, sem, spongy mesophyll, waxy cuticle

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