l9 osj PRINCIPLE OF SYSTEMATIZING OORALLINJE. 117 



we already find the Corallinaceous alga? accepted in the sence we give them 

 to day. 



For a progress in our knowledge of the Corallina?, we are much in- 

 debted to the " Memoir sur les Corallines," written in 184*2, by Decaisne, 

 who worked on the group taking them for plants. The forms treated of 

 are the same, with some additional species, as those enumerated by La- 

 mouroux, whose system is followed in the main. He, however, for the 

 first time utilized the form and the position of the conceptacles fur generic 

 characters. He divided Amphiroa into four sections ; and put the pinnated 

 Corallina under the section Haliptijhm. 



As regards the internal structure of the Corallina? there existed some 

 difference of opinion between Decaisne and Kiitzing. The former remarked 

 that the three genera, then known of the group, present an identical struc- 

 ture, while the latter^ counting the points of difference between them, 

 signalized the justifiableness of their generic distinction. 



In 1843 there appeared Endlicher's " Mantissa," supplement III, Alga?. 

 In it are enumerated all the Corallina? known at that time, and are 

 brought under the three genera Corallina, Jania and Amphiroa. The 

 author practically followed the system proposed by Decaisne, though effect- 

 ing transference of several species from one genus to another of greater 

 legitimacy. 



Zanardini' proposed a new genus Cheilosporum, under which Corallina 

 sagittata Larax. as well as certain species from Decaisne's fourth division 

 of Amphiroa were included. Shortly after him, Trevisan 4 ' observed that 

 the presence of the horns upon the conceptacles never offers constant 

 character, and that therefore Corallina and Jania should be united into 

 one genus; according to him the genus Cheilosporum is not sufficiently 

 characterized as to justify its separation from Amphiroa Larax. 



In 1848 Kiitzing enumerated all the known species, including his own 

 discoveries, and arranged them after the system proposed by Decaisne. In 

 the following year Trevisan BJ declared that Amphiroa Lamx. and Corallina 

 L. should be amalgamated, these two genera beiDg held simply for " apo- 

 these "-bearing and " tetragonia "-bearing forms of one and the same 



1 ) Memoire. p. 108. 



2) Ueber d. Polyp, (sec. Trevisan : Note sur les Coral, p. 820.) 



3) Revista sulle Coralline, (sec. Trevisan : 1. c.) 



4) Note sur les Coral, p. 821. 



5) Species Algarum. 

 G) 1. c. p. 822. 



