J905.] 



PRINCIPLE OF SYSTEMATIZING CORALLINE. 121 



contribute no less to the facts to be added, and more accuracy in the 

 definition of the genera than should have been expected from it. At 

 present we miist satisfy ourselves within the limit of the present knowledge 

 and try our best in applying all facts known heretofore. 



Certain differences are found in the morphological characters of con- 

 ceptacles in some genera or subgenera. The differences are the most im- 

 portant points in the systematic survey of the Melobes'ue : and also applicable 

 in some extent in the study of the Corallime. 



As referred to before, Trevisan tried to unite Amphiroa and (Jorallina. 

 The reason was that the former was a " tetragonia "-bearing form while 

 the latter was an " apothese "-bearing form : and he also declared that the 

 "tetragonia" originated from the medullary portions of the fronds and the 

 "apothese" from the cortical portions. 



Trevisan's view was overlooked by most algologists. However erroneous 

 may be his systematic view, there is an important point in his opinion 

 concerning the origin of spores. 



There is least doubt left concerning the generating position of earpospores 

 as well as tetraspores in Corallina and Jama. They are of medullary 

 origin. But in the plants hitherto described under the genus Amphiroa, 

 I found the spores sometimes of medullary and sometimes of cortical origin ; 

 yet always fixed according to the species and never disturbed. 



I extended my research in this direction and found that there are 

 some species with nearly allied structure of frond but different positions of 

 spore origin. I will treat of the matter a little further. 



While I was examining Japanese Corallime I met with several species 

 which were to be referred to the genus Arthrocardia A resell, (i) Some of 

 them had the conceptacles in the upper margins of the compressed reniform 

 or sagittate articuli, characteristic of Cheilosopmtm : (ii) others had. the con- 

 ceptacles exclusively on the flat surface of the sagittate or truncate articuli 

 and never in the margin : (iii) and several had both characters mixed 

 together. 



The actual examples of the first case are Chciluxporum yeasoenst, 

 Cheilosporum latissimum, etc. One cannot doubt that these species belong- 

 to the section Arthrocardia of Decaisne. 1 was fully convinced, in this 

 case, by Schmitz's opinion in uniting Arthrocardia to Cheilosporum. 



In the second case, the representative of which is Amphiroa aberrant, 

 I was quite sure that it had allied species among the member which were 

 enumerated by- Areschoug under Arthrocardia. 



Consulting Decaisne's and Areschoug's works carefully 1 found the 



