794 



nion corijmbosiim, C. pohjspernmm, FurceUaria fastigiata, Polijides 

 rotundus, Cnioriella Diibiji^ Chilionema replans, Sphacelaria cir- 

 rosa, Cladosiephiis spongiosus, Asperococciis echinatus, H(didrijs 

 siliqiwsa, Himanthalia lorea, Acrosiphonia flagellata, A. grandis, 

 Brijopsis phimosa, Derbesia marina; lo this group we may most 

 probably also refer Sterrocolax decipiens, which has certainly 

 not been found farther north than the Faeroes, so far as I 

 know, but which may be supposed to grow in the same re- 

 gions as Ahnfeltia. 

 VI. Southern forms, not found hitherto north of tlie Faeroes. and 

 West Norway: 



Porphijra leucosticta, Callophyllis laciniata, Callocolax neglecta, 

 Lomentaria articulata, Nitophylliim laceratam, Laurencia pinna- 

 tifida, Polysiphonia atrorubescens, Griffithsia setacea, Callitham- 

 nion graniilatiim, Rhodochorton seiriolanum, Phymatolithon la'- 

 vigatiim, Lithophylliim incriistans, L, hapalidioides, Ectocarpus 

 dasycarpus, E. granulosus, E. lucifugus, E. velutinus, Myrionema 

 foecunduni, Microsyphar Zosterce, Sphacelaria co'spitula, S. furci- 

 gera, Elachista scutulata, Punctaria latifolia, Desmotrichum un- 

 dulatum, Litosiphon Laminaricv , Valonia ovalis, Chlorogloea 

 tuberculosa, Dermocarpa violacea, Hyella ccespitosa, Lyngbya 

 lutea, Microcoleus tenerrimus, Calothrix a^ruginea and Choreo- 

 colax Polysiphonice. 



Lastly, we have the 6 new Fseroese species, and the 3 whicli 

 are only determined as to tlie genus. Of these, Myrionema fceroense 

 has been found at South -West Iceland and is thus already included 

 in the total number, and Laminaria fceroensis has been taken at 

 North-East Iceland and is included in the first group; thus there 

 are only 7 species left, of whicli nothing^ is known as to their oc- 

 currence outside the Faeroes, but of which some at least may prob- 

 ably also be found at Iceland. 



As to group I, it seems to me, that the 5 species it includes 

 must also be supposed to occur at South -West Iceland. I likewise 

 think it most likely, that the 10 species belonging to group II, may 

 be met with at Iceland. As to the 21 species of group III I think 

 there is some probability at any rate, that some of them may be 

 found at South -West Iceland, as they have been able to grow so 

 far north as the coast of Norway. 



^ Dermocarpa Farlowii excepted. 



