XIX 



we have divided the group in three parts, moslly for Ihe sake 

 of convenience with regard to our works on the Alga-vegetation of 

 Iceland and the Færoes, hut no capital phytogeographical import- 

 ance is connected to this division of the group. 



1. The following species go as far north as to South Iceland, 

 the Færoes or Northern Norway, and at least as far south as the 

 Mediterranean and North Africa. 



Rhodoplujceæ. 

 Porphyra leiicosticta Thur. 

 Chondrus crispus (L.) Stackh. 

 Callophj^llis laciniata (Huds.) Kiitz. 

 Lomentaria clavellosa (Turn.) Gaill. 

 L. articulata (Huds.) Lyngb. 

 Plocamium coccineum (Huds.) Lyngb. 

 Nitophyllum laceratum (Gmel.) Grev. 

 Laurencia pinnatifida (Gmel.) Lam. 

 Polysiphonia Brodiæi (Dillw.) Grev. 

 Pterosiphonia parasitica (Huds.) Falkenb. 

 Brongniartella byssoides (G. et W.) Bory. 

 Griffithsia setacea (Eli.) Ag. 



Callithamnion scopulorum Ag. 

 C. corymbosum (Sm.) Lyngb. 

 C. granulatum Ag. 

 Cruoria pellita (Lyng.) Fr. 



16 species. 



Phæophijceæ. 

 Punctaria latifolia Grev. 

 Asperococcus echinatus (Mert.) Grev. 

 Desmarestia ligulata (Lightf.) Lam. 

 Leathesia difformis (L.) Aresch. 

 Cutleria multifida (Smith) Grev. 

 Halidrys siliquosa (L.) Lyngb. 



6 species. 



2. The following species are distributed from North Scotland 

 (incl. the Orkneys) and West Norway southward. The most of 

 the species occur at least as far south as to the Mediterranean 

 and the Atlantic coast of North Africa, probably some of them go 

 farther south. Some of the species occur not farther south than 

 to England and West France. 



Rhodophijceæ. 

 Nemalion multifidum (W. et M.) J. Ag. 

 Helminthora divaricata (Ag.) J. Ag. 

 Gelidium crinale J. Ag. 

 G. pusillum Le Jol. 

 G. corneum Lam. 

 G. latifolium Born. 

 Phyllophora rubens (G. et W.) Grev. 

 Gymnogongrus Griffithsiæ (Turn.) Mart. 

 G. norvegicus (Gunn.) J. Ag. 

 Colacolepis incrustans Schmitz. 

 Callj'menia reniformis (Turn.) J. Ag. 

 Catenella Opuntia (G. et W.) Grev. 

 Rhodophyllis appendiculata J. Ag. 

 Rh. bifida (G. et W.) Kutz. 

 Sphærococcus coronopifolius (G. et W.) Ag. 



Gracilaria confervoides (L.) Grev. 

 Calliblepharis ciliata (Huds.) Kutz. 



C. jubata (G. et W.) Kutz. 

 Rhodymenia palmetta (Esp.) Grev. 

 Champia parvula (Ag.) Harv. 

 Chylocladia kaliformis (G. et W.) Hook. 

 Ch. ovalis (Huds.) Hook. 

 Nitophyllum Gmelini Grev. 



N. Bonnemaisoni Grev. 



N. Hilliæ Grev. 



N. punctatum (Stackh.) Grev. 



N. uncinatum (Turn.) .1. Ag. 



[Grinnellia americana (Ag.) Harv.J 



Delesseria Hjpoglossum Lam. 



D. ruscifolia (Turn.) Ag. 

 [Caloglossa Leprieurii (,Mont.) Ag.| 



2* 



