1917] 



DUNN—DUMONTIA 



429 



apparently no regular or constant system of branching, and the 

 number of branches present is not related to the height of the 

 plant (figs. 1-7). The plants shown in figs. 1 and 2 have almost 



Figs. 1-3. — Mature female plants showing cystocarps imbedded in thallus 



the same number of branches, and their respective heights are 

 7 cm. and 19 cm. All the cystocarpic plants found were branched. 

 Tetrasporic plants were found which were 12 cm. in height and 



