HYPODERMAL CELLS
Hypodermal cells occur in sarsaparilla root and in triticum. In the cross-section of sarsaparilla root (Plate 37, Fig. 1) the hypodermal cells are yellowish or yellowish brown. The outer wall is thicker than the inner wall, and the cell cavity is mostly rounded, and contains air. The walls are porous and finely striated. On longitudinal view, the hypodermal cells of sarsaparilla (Plate 37, Fig. 2) are greatly elongated, and the outer and side walls are thicker than the inner walls. The ends of the cells are blunt and distinct from each other.
In cross-section, the hypodermal cells of triticum (Plate 37, Fig. 3) are nearly rounded in outline, and the walls are of nearly uniform thickness. In longitudinal view (Plate 37, Fig. 4) the same cells appear parenchyma-like, and the walls between any two cells appear common to the two cells.
PLATE 36
Longitudinal Sections of Endodermal Cells
1. Sarsaparilla root (Smilax officinalis, Kunth).
2. Triticum (Agropyron repens, L.).
3. Convallaria (Convallaria majalis, L.).
4. Aletris (Aletris farinosa, L.).
PLATE 37
Hypodermal Cells
1. Cross-section sarsaparilla root (Smilax officinalis, Kunth).
2. Longitudinal section sarsaparilla root (Smilax officinalis, Kunth).
3. Cross-section triticum (Agropyron repens, L.).
4. Longitudinal section triticum (Agropyron repens, L.).