UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



BOTANY 



Vol. 6, No. 16, pp. 429-454, plates 36-37 July 16, 1918 



NEW PACIFIC COAST MARINE ALGAE II 



BY 



NATHANIEL LYON GARDNEE 



On various occasions in the recent past while collecting algae along 

 this coast, I have come across specimens of marine Myxophyceae which 

 I have set aside for future study. In this paper I am presenting 

 thirteen species of them, new to science. They all very naturally 

 conform to the order Coccogoneae as proposed by Thuret (1875) and 

 amplified by Kirchner (1898). With the exception of two species of 

 Chlorogloea, belonging presumably to the family Chroococcaceae of 

 Naegeli (1849), they may readily be placed in the group Chamae- 

 siphonaceae of Borzi (1882). 



The chief difficulty which has been encountered in this study is 

 the segregation of them into their proper genera. The genera which 

 are particularly troublesome in this respect are Dermocarpa and 

 Xenococcus, which in certain stages of their development are decidedly 

 confusing; and Hyella and Radaisia, the limits of which have not been 

 clearh' defined. 



Dermocarpa and Xenococcus growing apart from each other, and 

 in their typical mature forms are not difficult to determine. The 

 former genus has increase in the number of individuals by the forma- 

 tion of gonidia only, while the latter has increase by vegetative cell- 

 division as well as by the formation of gonidia. But if species of these 

 two genera happen to be intimately associated on the same host, it 

 becomes a matter of considerable difficulty and uncertainty to state 

 definitely to which genus a particular individual in a group belongs. 

 One such instance has been encountered in the brief stud}^ the results 

 of which I am presenting in this paper, that of Dermocarpa pacifica 

 and Xenococcus chaetomorphne, as I have interpreted them, growing 

 on Chaetoviorpha aerea. The character of the host in this instance, 

 as I shall point out later, seems to have had considerable influence 



