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Wood of a primitive conifer, Auracaria

Light micrograph (radial longitudinal section) ofthe wood of a primitive conifer, Auracaria cunninghamia, the monkey puzzle tree. Themicrograph shows pits (yellow & blue spots) withinthe tracheids (cylinder cells). Tracheids arerelatively primitive, non-living cells of thexylem. They are elongated with tapering ends &have thick lignified walls. They providemechanical support & conduct water for the plant.Pits are cavities in the tracheids, which allowexchange of substances between adjacent cells. Thethinner cross walls here are medullary rays. For afossil ancestor of this conifer see E440/037.Magnification X40 at 35mm size.. Stunning Photo Gifts From Science Photo Library