1904} BRIEFER ARTICLES 149 
nate, and the laminae displayed at the summit of the stipe have arisen 
by repeated longitudinal splitting of the original single lamina. 
Alaria, on the other hand, maintains its original mid-lamina without 
splitting, and this would be found at the center of the tuft, while the 
conspicuous laminae are the modified and hypertrophic gonidiophylls. 
— 
Fic. 2.—Plants of Postelsia palmaeformis Rupr. (on the left) and A/aria nana H. 
F. Schrader (on the right). Extreme cumaphytic form. After photograph by C. J. 
ibbard, 
Yet, while developed in this different manner, the ultimate result is, in 
each case, a tuft of leaves at the end of a short, thick, and firmly 
attached stipe. 
The series of plants as displayed upon the rocks is certainly very 
instructive and to be fully appreciated must be studied in the field 
In this note I have attempted merely to indicate the extreme form 
which an Alaria may assume in the cumaphytic habitat.—Conway Mac- 
MILLAN, University of Minnesota. 
