The Structure and Development of Grinnellia 
americana, Harv. 
BY 
MELVIN A. BRANNON. 
With Plates I-IV. . 
k HE investigations on the reproduction and development 
JL of Grinnellia americana were undertaken for the reasons 
that Grinnellia is distinctively an American species and that 
little was known of the structure and development of the 
cystocarp. The work was taken up at the suggestion of 
Dr. William A. Setchell, Director of the botanical department 
of the Marine Biological Laboratory at Woods Hole, Mass., 
and was brought to its present stage in the summer of 1894. 
For Dr. Setchell’ s continuous interest and very valuable 
assistance in the prosecution of the work I am under deep 
obligation. Through the kindness of the Trustees and of 
Dr. William Trelease, Director of the Missouri Botanical 
Gardens, I occupied the room subscribed for by them during 
the summers I was engaged in the study of Grinnellia ; for 
this privilege I am also greatly indebted. 
Grinnellia americana , as stated above, is distinctively an 
American Alga, never, so far as learned, having been reported 
from other waters than those of the west Atlantic coast. It 
ranges from the mouth of the Weymouth River, Mass., to 
[Annals of Botany, Vol. XI. No. XLI. March, 1897.] 
