F. Børgesen: List of species. 459 



elusion that, in spite of the very different anatomical features 

 found in the different forms and upon which Kjellman based 

 his grouping of the species, Kjellman's "species" of one of the 

 groups nevertheless represent, in all probabihty the tetrasporic 

 or sexual form of another "species" referred to another group. 



For instance the species of the sectio "Feprecwfe" of Kjell- 

 MAN represent the sexual plants, and those of the sectio "Bra- 

 chycladia" the tetrasporic plants of corresponding species. And 

 the group Rhodiira is made up of tetrasporic plants whose cor- 

 responding male and female plants are to be found in the groups 

 Microthoe and Eugalaxaura of Kjellman. 



How different the two corresponding forms of the same plant 

 are, is best seen by comparing some of my figures of the anato- 

 mical structure as given above. Nobody would imagine taht 

 the Galaxaura occidentalism as it is described and figured on pag. 

 110 — 11, could belong to the same species as G. marginata^ the 

 anatomical structure of which is shown in Fig. 116. 



According to Howe the forms found in the West Indies 

 might be grouped in this way: 



39. Galaxaura marginata (Sol.) Lamx. 



(sétxual form: G. occidentalis Børgs.j. 



40. Galaxaura squalida Kjellm. 



(tetrasporic form: G. flagelliformis Kjellm.). 



41. Galaxaura rugosa (Solander) Lamx. 



(tetrasporic form: G. subverticillata Kjellm.). 



42. Galaxaura cylindrica (Solander) Kjellm. 



(tetrasporic form: G. lapidescens (Sol.) Lamx. 



43. Galaxaura oblongata (Ell. et Sol.) Lamx. according to Howe, 

 the right name for G. fragilis (Lamarck.) Kjellm. 



(tetrasporic form: G. comans Kjellm.). 



44. Gelidium corneum (Huds.) Lamour. 



45. Wrangelia Argus Mont. 



46. — bicuspidata Borgs. 



47. — penicillata C. Ag. 



48. Halymenia Floresia (Clem.) Ag. 



49. Grateloupia filicina (Wulf.) Ag. 



50. — dichotoma J. Ag. 

 5L — cuneifolia J. Ag. 



