54 COLEOCH&TE. 



oospores form zoospores, and from the zoospores there 

 develop plants which after a period of growth can de- 

 velop oospores again. 1 



1 It will be profitable at this stage to compare nutritive structures and 

 the methods of reproduction in Ulothrix, Spirogyra, Cladophora, Vau- 

 cheria, and Coleochate with similar structures and processes in the red 

 Algse (Rhodophyceae) and in the brown Algae (Phaeophyceae). In addi- 

 tion to laboratory work, the following references suggest sources of 

 information in addition to the text descriptions, which all should read: 



(a) Davis, B. M. Development of the cystocarp in Champia parvula. 

 Bot. Gaz. 21 : 109-117, 1896. 



(6) Fertilization in Batrachospermum. Ann. Bot. 10: 49-76, 



1896. 



(c) Farmer, J. B., and Williams, J. L. Contributions to our knowledge 

 of the Fucaceae. Phil. Trans. Royal Soc. London. Ser. B. 190: 

 623-645, 1898. 



(d) Chester, Grace D. Notes concerning the development of Nema- 

 lion muttifidum. Bot. Gaz. 21 : 340-347, 1896. 



