1915 Kibbe; on Alaria 57 



12. In forming sporophylls a ridge is sent out along each sharply 

 angled side of the flattened rachis. A portion of the pith-web is sent 

 out into each ridge. Rifts form in the pithy region. The ridge becomes 

 irregularly and more and more deeply lobed, until the leaf-like sporo- 

 phyllsj each enclosing a portion of the pith-web, are formed. 



CITATIONS 



Frye, T. C. The Kelp Beds of Southeast Alaska, pp. 60-104, of 

 Report No. 100, U. S. Dept. Agric, 1915. 



MacMillan, Conway. Bull. Torr. Bot. Club. 26: 273-296. 1899. 



Setchell, W. A., & Gardner, N. L. Algae of Northwestern America. 

 Univ. Calif. Pub. Bot. 1: 165-418. 1903. 



Sykes, M. G. Anatomy and Histology of Macrocystis pyrifera and 

 Laminaria saccharina. Ann. Bot. 22: 291-325. 1908. 



Yendo, K. The Distribution of Marine Algae in Japan. Postelsia 

 for 1901; pp. 179-192, published in 1902. 



