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.