— 114 — 



demonstrated in Plate III, which shows the transitions between forma 

 prolifera-secundata (fig. 13 and 14), pedicellata-virgata (fig. 15) and 

 subtypica-modificata vera (fig. 16, 18) and irregularis (fig. 17) 1 ), they 

 are difficult to limit to each other. I entirely reject such species 

 as C. secundatum and pedicellatum in so far as these species only 

 comprise the typical forms; but as before said on the other hand 

 I admit the possibility of such two or more small species (my 

 types) with very large limits. Whatever the matter now may be 

 I think it suitable to establish the forms in groups arround the 

 types as it is proposed in the following. 



On the coasts of the Færoes a great number of forms of C. 

 rubrum occur. The specimens are thoroughly well developed, and 

 this species seems to thrive particularly well here. All these forms 

 are in my opinion best ordered into 6 types viz.: 

 the type prolifera-secundata 



— — pedicellata-virgata 



— — subtypica-modificata 



— — fasciculata 



— — lineata 



— — linearis. 



The three firstnamed types comprise many forms; especially 

 are the irregular forms developed. Within the second type it is 

 only the subforma virgata which occurs. As I am understanding 

 this form, it represents the tetraspore-bearing stage of the forma 

 pedicellata Agardh figured in Kylin : Die Algenflora . . etc. Tab. 6. 

 fig. 2. The forma fasciculata type is perhaps rather to be consi- 

 dered as a species; at all events it is nearer to be a species than 

 the other. The type forma subtypica-modificata corresponds to- 

 tally with the forms signified with this name in my paper (1908). 

 They are evidently forms which are confined to water with small 

 contents of chloride of sodium. That such less salt water is occur- 

 ring on the coasts of the Færoes is not to be wondered at: the 

 many currents from the rocks lead much fresh water into the sea 

 which often in the "fjords" is mixed rather slowly with the salter water. 



In my opinion forma pedicellata-virgata is especially found in 

 localities with streaming, rough sea. The type forma prolifera- 

 secundata is, as communicated in I p. 104, especially bound to 

 shallow water in the Gorallina-zone. 



x ) In my paper 1908 I named this form irregularis. According to the nomen- 

 clature used in this paper it must be named f. modificata-irregularis or 

 subtypica-irregularis. 



