PLATE XXXI. 



CHARA CONTRARIA. 



Fig. 1, Plant, natural size. 

 '• 2, Stem, showing cortication, leaf, and stipular whorl. x50. 

 " 3, Part of a leaf showing naked end-cells, and two fertile corti 



cated nodes. x50. 

 " 4, Cross-section of stem; a young spine. x50. 



