9 



a length of up to 1,5cm., and the breadth varies from 14—17//. 

 Some specimens growing on Chœtomorpha Melagonium differed 

 in this, that some of the erect filaments sometimes were growing 

 spirally round the Chœtomorpha filament. 



The longest specimens were found growing in the littoral 

 region in a crack on Stenö. 



Gr. or.: Tasiusak, Kangarsik, Stenö, Nualik. 



17. R. penicilliforme (Kjellm.) K. Rosenv. Algues mar. d. Grl. 

 p. 66. Deux. Mém. p. 23. R.. mesocarpum (Carm.) v. penicilliforme 

 Kjellm., K. Rosenv. Grl. Havalg. p. 792. 



This species grows on Bryozoa as well as on different algee. 

 On the Bryozoa it always occurs together with R. membrana- 

 ceum. Some specimens found on Chœtomorpha Melagonium 

 are specially remarkable on account of their elegantly developed 

 basal discs and their luxuriant growth altogether. The erect 

 filaments were vigorously developed with undivided and divided 

 sporangia; 2 — 3 unilateral branches were not rarely met with. 

 The thickness of the filament varied from II — 16//. 



Gathered in May, June, August and September. Tetraspores 

 were observed in a gathering from August. 



Gr. or.: Tasiusak, Ikerasak, Kangerdlugsuatsiak, 



18. R. membranaceum Magnus, K. Rosenv. Grl. Havalg. p. 794. 

 Deux. Mém. p. 23. 



Some sterile specimens were collected in June and Sep- 

 tember, growing on Bryozoa together with B. penicilliforme. 

 Gr. or. 1 Tasiusak, Ikerasak. 



Fam. Rhodomelaceæ. 



Rhodomela C. Ag. 



19. R. lycopodioides (L.) Ag., K. Rosenv. Grl. Havalg. p. 796. 

 Deux. Mém. p. 24. 



a. typica Kjellm. 



The specimens I have had for examination belong to f. com- 



