no,.] PRINCIPLE OF SYSTEMATIZING CORALLINjE. 123 



latter character is by no means a fixed one and hardly reliable as a 

 generic value. 



Lithothrix and Metagoniolithon have the propagating cells originated 

 in the medullary cells as far as I could judge. Of Litharthron we know 

 nothing about the propagating organ. 



2. Ramification. The mode of branching had been regarded as an 

 important character, both generic and specific, since Lamouroux's time. 

 But the unreliability of the character was announced by the later system- 

 atists. They agreed in thinking the ramification, however remarkable 

 peculiarity it may possess, of no generic value. The plants with verticillate 

 ramuli were reckoned under the genus which comprised the plants with 

 dichotomous branches: The pinnated CoraUina and the dichotomous Jania 

 were combined into one genus. 



The view that reduced Jania into CoraUina is from Solms-Laubach.^ 

 He was undoubtedly strengthened by Areschoug's remark 2) and seems to 

 have regarded the pinnated ramuli of Jania corniculata, found at the 

 upper corners of its articuli, to have special significance in consideration 

 of its systematic position. They seem to be inclined to think that Jania 

 have sometimes pinnated ramuli and that therefore the essential character 

 to separate Jania from CoraUina — the dichotomy of branches— can no 

 more be relied upon. The former writer united Jania corniculata with 

 Jania rubens, and referred it to CoraUina. His followers transferred other 

 Jania species all to CoraUina. 



The pinnules from the upper corners of articuli characterizes CoraUina 

 in a way. But in the view of the present writer, they are always found 

 at the upper portions of the fronds and never confined to the basal articuli. 

 Nor can we find the dichotomous branches at the terminal portions of the 

 fronds of CoraUina in the normal cases. The pinnules, however, of Jania 

 cornictdaia, are much more developed in the lower articuli than in the 

 upper ones, being sometimes limited to the basal articuli. There is a great 

 contrast between the two forms. 



The Eurytion is distinguished from other sections of Amphiroa by 

 having regular dichotomous ramification. It may not, however, be equally 

 valued as Jania. There are gradual changes iu the ramifying mode of the 

 Eurytion, approaching to the irregularity as found in the Euamphiroa. 

 Even in the same species some are plainly irregular while others are highly 



1) CoraUina. p. 6. 



-1) J. Ag. Spec. Alg. II. p. 554. 



