178 University of California Publications. [Botany 



been of the greatest help in aiding us in finding the correct 

 geographical names and in fixing doubtful localities. To all of 

 these persons, we return our most sincere thanks. 



CYANOPHYCE.E. 



The members of this group are sometimes placed among the 

 algae, sometimes placed separately in a division with their near 

 relatives the Schizomycetes or Bacteria, which is called Schiz- 

 ophyta. While we believe that this is the proper method of 

 classification, we also feel that the term alga? is only a general 

 one and the recognition that the Cyanophyceaa and Bacteria are 

 phylogenetically distinct from groups, such as the Chlorophyceas, 

 the Phasophyceaa, etc. does not preclude the extension of the term 

 to them. These groups are also distinct from one another in a 

 similar way, but perhaps less pronouncedly. The greater number 

 of the Cyanophyceae enumerated as belonging to our territory are 

 not marine, but are largely cosmopolitan fresh water species, able 

 to endure a considerable range of temperature. In studying the 

 marine species of this group, there seems to be a decided falling 

 off, both in the number of species and abundance of individuals, 

 as we proceed to the northward. This does not hold good for 

 the species of the fresh waters. In studying and arranging our 

 forms, we have followed the works of Bornet and Flahault (1886 

 — 1889) as regards the heterocysted forms and the monograph of 

 Gomont (1893) for the homocysted forms. The Chroococcaceae 

 and the Chamaasiphoniacea? present difficulties hard to overcome. 

 For genera, much help was obtained from Kirchner's arrange- 

 ment (1898), also considerable assistance as regards species. 

 The specific determinations of these groups, however, will remain 

 very uncertain until some worker follows the example of the 

 French Algologists mentioned above, and gives us a good prac- 

 tical monograph. At present the student must consult the 

 special papers of Nasgeli (1849), Meneghini (1846), Kirchner 

 (1878), etc. 



