Explanation of plates. 



Fig. 1. A typically prostrate specimen of Leontodon autumnalis horn an exposed locality. From 

 Waeming, 1909. 



Fig. 2. Erect rosettes of Leontodon autumnalis growing in diffuse light. 



Fig. 3. Atriplex latifolium prostratum exposed to ordinary light for 4 weeks and then placed in 



diffuse light for 3 weeks. 

 Fig 4. A specimen of Boripa palustris exposed to bright light. 



Fig. 5. Specimens of At7'iplex patulum prostratum, the left one exposed to ordinary light, the 



right one placed in obscure light for 4 days. 

 Fig 6. Specimens of Plantago coronopus, the left one exposed to bright light, the right one 



growing in diffuse light. 



Fig. 7. Specimens of Glyceria maritima, the left one exposed to bright light, the right one 

 placed in diffuse light for 10 days. 



(Printing finished December 5, 1919.) 



