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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

Fig. 7.1-2. Transverse section of wood of oak (Quercus). This micrograph is also an introduction to much of the xylem you might see in lab; wood is secondary xylem. The very large white space (V) is the lumen of a vessel element; this single cell has a volume that is thousands of times greater than that of many of the other cells here. Three other, smaller vessel elements (one labeled with v) are also present. The small white dots (two are indicated by arrows at the bottom of the micrograph) may look like very narrow vessel elements are first glance, but they are parenchyma cells in the wood. You cannot tell that from this photograph, but at very high magnification, you would be able to see that they have only a thin primary wall, not a thick secondary wall. All the very dark red small cells are libriform fibers.