Up Primary xylem Oak wood Leaf vein Vein ends Bean seed Pine tracheids, xs Fern TE, xs Fern, TE, mag Annular walls Annular, stretched Annular, narrow Scalariform walls Scalar., narrow CBP, pine CBP, dicot CBP, irregular Contact faces Pits, side view CBP, pine, xs CBP,angio, xs CBP, fern, xs Contact face, xs Simple perf. plate 1 Simple perf. plate 2 Pitted perf. plate Perf. plate & helix Perf. plate, face Perf. plate, mag Perf. plate, section Perf. plate rim Perf. plate & wall Scalariform Per plate Primary xylem Vessel sizes Fern TE Pine needle VE precursor, ls Protoxylem 9 Contact faces VE precursor, xs Precursor 2 Torn vessel Torn vessel 2
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Fig.
7.4-2.
Transverse section of wood of grape vine (Vitis). It is quite common for vessels
to be of many different sizes within a single plant. All the
“empty” white cells are vessels (four marked with V), and some are more than
ten times wider than others with a much greater conductive capacity. It would
not be too unusual for fibers to be as wide as the narrowest vessels here, but
they were never be as wide as the largest vessel in this micrograph.
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