LM of the wood of a primitive conifer

LM of the wood of a primitive conifer

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Caption: Light micrograph (transverse section) of the wood of a primitive conifer, Auracaria cunninghamia, the monkey puzzle tree. The micrograph shows tracheids (pebblelike) with some pits (tiny white circles) visible connecting two tracheids together. Tracheids are relatively primitive, non- living cells of the xylem. They are elongated with tapering ends & have thick lignified walls. They provide mechanical support & conduct water for the plant. Pits are cavities in the tracheids, which allow exchange of substances between adjacent cells. For a fossil ancestor of this primitive conifer see E440/034. Magnification X40 (at 35mm size).

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Keywords: araucaria cunninghamia, botany, conifer, gymnosperm, gymnosperms, light micrograph, monkey puzzle, nature, pit, plant, tracheid

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