Transverse Section of Pinus Excelsa Leaf
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Pinus is a genus of hardy, evergreen trees. Pictured are the strengthening cells (1), ducts surronded by strengthening cells (2), wavy chlorophylla bearing cells (3), bundle sheath (4), fibro-vascular bundle (5), stomata (6), and internal duct (7).
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Cellular BotanySource
Nicholson, George The Illustrated Dictionary of Gardening, Div. VI (London, England: L. Upcott Gill, 1884)
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