EXPLANATION OF THE ILLUSTRATION 
PLare XI, A few contrasting cell types from a 
cross-sectional view of the outer pistillate glume of 
an ear with the vestigial glume character. Note 
that the smaller cells have a higher degree of lig- 
nification in the secondary walls (the stippled area). 
About 500 times natural size. 
Drawn by Warron C. GaLinat 
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