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Radial section through the stem of pine: tracheids with bordered pits, parenchyma rays

Legend:

1  ray parenchyma 
2  bordered pit in tracheid

English name: Pine
Scientific name: Pinus sp.
Familia: Pinaceae
Classis: Coniferopsida
Phylum: Gymnospermae
Regnum: Plantae

The ray parenchyma contains living cells that enable the (horizontal) transport of nutrients and water. Tracheids are dead cells that play a role in the (vertical) transport of water and dissolved minerals. Pits in the tracheids provide a passage through which water and minerals can be flow from one cell to another.


last modified: 19 Sep 2003