a^yd 



A Magazine of General Botany 



VOLUME 17 



T^ U M B E R 5 '^ t 



MAY 1914 



CONTAINING 



Thermotropism in Roots 



By Henry D. Hooker, Jr.,. I35 



A List of Lichens Collected in Newfoundland, with Critical Notes on 

 the Family Usneaceae 

 By R. Heber Howe, Jr 154 



Books and Current Literature 161 



Notes and Comment 155 



PUBLISHED MONTHLY 



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Entered ae second-t-lass mattor March 9, 1912, at the post office at Baltimore. Marv'land. under the Act of July 16, 1894 



