Histology of medicinal plants

by William James Mansfield

Medullary rays. The medullary rays vary from ten to twenty cells in height according to the part of the medullary ray bundle cut across.

PLATE 105
Cross-Section of Quassia Wood (Picræna excelsa [Sw.], Lindl.)

1. Vessels.
2. Medullary rays.
3. Wood parenchyma.
4. Wood fibres.

PLATE 106
Tangential Section of Quassia Wood (Picræna excelsa [Sw.], Lindl.)

1. Vessel. 2. Wood parenchyma. 3. Wood fibre. 4. End wall of medullary ray cell. 5. Medullary ray bundle.

PLATE 107
Radial Section of Quassia Wood (Picræna excelsa [Sw.], Lindl.)

1. Showing the height and length of the medullary rays and cells.
2. Cells with starch.
3. Wood parenchyma and wood fibres.