Transverse section through the stem of pine showing bordered pits |
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With labels Legend:
1 tracheid 2 bordered pit in tracheid wall
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English name: Pine Scientific name: Pinus sp. Familia: Pinaceae Classis: Coniferopsida Phylum: Gymnospermae Regnum: Plantae
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Water transport between tracheids is possible through the primary wall at the level of the pits, but not in the other regions of the tracheids where the secondary wall is very thick. |