II. 



CORALLINEAE VERAE OF THE MALAY ARCHIPELAGO 



BY 



A. WEB ER— van bosse. 



W'ith plate XIV— XVI. 



Introduction. 



In Areschoug's Corallineae in J. G. Agardh's Species, Genera et Ordines Algarum, 

 the Corallineae verae are divided into five different genera: Amphiroa, Arthrocardia^ Cheilo- 

 sporum, J'ania and Corallina. The distinction between these genera is based upon the position 

 which the conceptacles, keramidia Aresch., occupy on the plant. The validity of these five 

 genera has often been disputed; "Jania and Corallina have so many characters in common that 

 Solms-Laubach united j'ania to Corallina in his excellent monograph "Die in Neapel's Umgebung 

 bis jetzt beobachteten Corallineenformen", and Schmitz and Hauptfleisch in Engler und Praxtl's 

 "Pflanzenfamilien" I Theil, have sunk Arthrocardia into Cheilosporum. The characters hitherto 

 employed to distinguish the genera are indeed very confusing, for they are very variable, and 

 again the characters distinguishing the species are not better defined than those of the genera. 

 It was therefore with much doubt as to the success of my work that I undertook to name the 

 Corallineae of the Siboga Expedition. 



This collection contained a great number of specimens belonging to different species of 

 Amphiroa ■. Arthrocardia failed to be represented; of Cheilosporum there were two species, of 

 j'ania two and of Corallina one. Amphiroa as forming the greatest bulk of the collection was 

 studied first; and this study afforded me material for modifying the whole group of the Coral- 

 lin, ' . The following pages however treat principally of the genus Amphiroa. 



\\ hile naming the Amphiroae of the Siboga Expedition I was struck by the fact that 

 two or three species, of which 1 had much material at my disposal, showed such differences in 

 their ontward appearance, that, seen apart, the different branches of one plant would have to 

 be ranged under different species if I were to use the ontward form of the joints or the position 



