Figure 7.8. A typical dicot stoma. A. Surface view. B. View in transverse section.

Chapter 7

Chapter 7

Venation Leavs Mindrib
Figure 7.Q Net venation in an Aristolochia leaf, x50.

Monocot leaves, besides having parallel veins, usually do not have the mesophyll differentiated into palisade and spongy layers. Some monocot leaves (e.g., those of grasses) have large, thin-walled bulliform cells on either side of the main central vein (midrib) toward the upper surface (Fig. 7.10). Under dry conditions, the bulliform cells partly collapse, causing the leaf blade to fold or roll; the folding or rolling reduces transpiration (see also Fig. 11.19).

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