F. Børgesen: Rhodophyceæ of the Danish W. Indies. 



199 



The specimen from St. Croix had tetrasporic conceptacles ; 

 these were developed not only in the uppermost joints below the 

 dichotorjiy, but also farther down in the plant. Perhaps we in 

 this have a means to distinguish the two plants in question, in 

 any case I have always found the conceptacles in the uppermost 

 joints in the forms I have referred to Jania adhærens, but I 

 may point out that I have seen only very few fruiting specimens. 



Fig. 188. Jania capillacea Harv. Part of a sterile plant and a branch with 

 tetrasporic conceptacles. (About 15 : 1). 



Unquestionally Jania capillacea comes near to Jania adhærens. 

 What especially distinguishes it from this species is the frequently 

 obtuse angles and the arch-shaped, recurved, squarrose filaments. 



St. Croix (without locality) Benzon. 

 Geogr. Distrib.: West Indies. 



5. Jauia spec. 



On a reef in the harbour of St. Thomas I have collected a 

 few small sterile pieces of a Jania which perhaps are referable 

 to Jania rubens (L.) Lamx. They differ from the two preceding 

 species by the tapering of the joints towards the ends, these 

 being not so markedly cylindrical as is the case of these species. 



The thicker joints are about 150// thick and 2 — 3 times as 

 long, the thinner about 80 — 90 // thick. 



