1 882.J On some American forms of Chara coronata. 361 



The cells of the coronula vary greatly from the closely-set short 

 cells of the more common forms to the divergent and elongated 

 cells of Brannii-tenera , which exhibits an approach to the Sand- 

 wich island form (var. Oahiiensis A. Br.). 



These varying characters with their numerous combinations 

 seem to us to render a division of the species into definite varie- 

 ties well nigh impossible. As it has now become unadvisable to 

 bestow distinctive names upon the numerous forms of that truly 

 polymorphic species C. foetida A. Br., so in view of the now 

 numerous and rapidly multiplying forms of C. coronata, it seems 

 to us proper to describe them as forms peculiar in many cases to 



The variations of this plant may be tabulated as follows, 

 giving prominence to the size of the nucleus and length of the 

 bracts, allowing also for variations in the habit of growth, et 



A. Pachygyra, nucleus with thick piominen 

 Mi. roptila, bracts shorter than the sporangium 



U. Macrocarpa, nucleus more than 600 {*. in length. 

 1. Macroptila, microptila or meioptila. 

 A. Pachygyra or Leiopyrena. 



III. Meiocarpa, nucleus of medium size, between 500 and 600 /i. long, 



The American forms may be arranged and designated as fol- 

 lows, beginning with those having the smallest nucleus : 



1. Forma tenuior, microcarpa, microptila, unilateralia, laxior, 

 ox ygyra (var. Braumi tenera A. Br.). This form was collected 



