THE EFFECT OF EXTREME SHADE UPON LEAF FORM AND STRUCTURE INVICIA AMERICANA

摘要

A comparative study of light and shade leaflets of a common flowering plant (Vicia americana) reveals striking differences in leaflet form, size, thickness, and internal structure. The marked thinness of shade leaflets is due to the failure of the mesophyll cells to enlarge, and their peculiar folded form is attributed to the same cause.