1881.] Tradescantia and Indian Corn. 765 
semicircular, while at others the lobes are so strongly marked as 
to make the cell approach a trefoil. Occasionally, as in Trades- 
PLATE. iI. 
INDIAN CORN. 
<antia, the ordinary number of these cells is increased, and an 
additional one is present; but this is apparently formed by the 
