28 ART. 12. K. YENDO. 



Laubach^^ united Jania Lamx. with Corallina Lamx. He noticed 

 tlie pinnated ramuli in Jania corniculaia and referred it to a 

 variety of Jania ruhens. He also, at the same time, remarked 

 that the pinnation is a character which has hitherto played the 

 important part in separating Corallina from Jania, which was 

 defined as branching dichotomously. 



I can not acquiese in the opinion that the pinnation of Jania 

 corniculata Lamx. is identical in its nature with that of Corallina. 

 The members of Jania seem to have the ability of issuing pin- 

 nate or subpinnate ramuli at the lower portion of a frond. Jania 

 micrarthrodia f. antennina (Kütz.) is the actual example, besides 

 the above mentioned species. Cf. Tab. Phyc. VIII. Taf. 84. fig. 1. 

 Yet all the members of Jania are sharply defined as having the 

 dichotomous branches at the apical portions of the fronds. The 

 conceptacles of Jania, even in the pinnated fronds, are always 

 found at the dichotomous points of the upper ramuli, or at the 

 apical points. In Corallina, as a rule, they are at the ends of 

 pinnae or the pinnules. I cannot discover any necessity of uniting 

 both genera simply for the reason that there is a species in a 

 genus which shows, in a manner, a similar character to one found 

 in the other genus ; and more so, if this common character is a 

 vegetative one. This circumstance suggests to us that both genera 

 are related to one another and not that they must be united 

 into one. 



I held this opinion long ago and mentioned Jania, as a sub- 

 genus in the list of Japanese Corallinaceœ.^^ But I found it 

 better to restore the genus in Lamouroux's sense. The regularity 

 of the dichotomous ramification, which is rarely disturbed, seems 



1) Corallina. p. 6. foot note. 



2) Enumeration of Cor. Alg. p. 19o. 



