The Structure and Development of Grinnellia 

 americana, Harv. 



BY 



MELVIN A. BRANNON. 



With Plates I-IV. 



THE investigations on the reproduction and development 

 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.] 



B 



