143 — 



NW. I c el. Isafjöröur (CO.; G. Guömundsson). 

 S W.I c el. Gommon. 



S. I cel. Eyrarbakki (Strömfeit); Vestmannaeyjar. 



Polysiphonia arctica J. Ag., Rosenv., Grl. Havalg. p. 800. 



In the sublitoral region in a depth of 2 — 30 (usually 7—12) fathoms. 

 In August I met with few specimens with tetraspores. The number of the 

 pericentral cells I have found varying from 4 to 7, but usually they are 

 6 — 7, sometimes 5 — 7 (cfr. Rosenv. 1. a). 20 — 30 cm. high. 



E. Icel. Common. 



N. I c el. Probably common. Eyjafjöröur; Skagafjöröur (Grønlund). 

 NW. Icel. Gommon. 

 S W. I c e I. Stykkishölmur. 



Polysiphonia nigrescens (Huds.) Harv., Kjellm., The Algæ of the Arctic- 

 Sea p. 126. 



In rock-pools in the lower litoral zone. Collected in July — Sept., 

 with cystocarps in September. 6 — 8 cm. high. 

 NW. Icel. Skâlholtsvi'k. 

 S W. Icel. Melar, Ölafsvi'k. 



Rhodoinela lycopodioides (L.) Ag., Strömf., Algveg. p. 23. 



It grows in the lower litoral zone and in the sublitoral region to a 

 depth of c. 10 fathoms. Collected with cystocarps in March — Sept., with 

 tetraspores in April— Sept. Specimens collected in December and January 

 are sterile. Specimens collected in the autumn consist of the main-axis 

 without the branches and are of the same appearance as designed in the 

 El. dan. T. 357. Specimens collected in the spring (April— May) have the 

 elongated branches richly developed. It occurs with hairs in March— Sept., 

 but in Aug— Sept. specimens without hairs are not rare. 6 — 17 cm. high. 



Following forms of the R. lycopocUoides occur: 



f. compacta Kjellm. 



f. laxa Kjellm. 



f. tenera Kjellm. 



The f. laxa is the most common. Ström felt further mentions the 

 f. Cladostephus (J. Ag.) Kjellm., but I think that Strömfelfs f. cladostephus 

 is referable to Kjellmans f. laxa. 



Probably common round Iceland. 



E. Icel., N. Icel., NW. Icel. and SW. Icel. common. 

 S. Icel. Eyrarbakki, Vestmannaeyjar. 



Odonthalia dentata (L.) Lyngb., Strömf., Algveg. p. 23. 



In the sublitoral region in a depth of 2 — 20 (usually 3—10) fathoms. 

 Small specimens, 2 — 4 cm. high, occur in the litoral zone in rock-pools. 

 Collected with tetraspores in January, June and Sept.— Octob. 



Botanisk Tidsskrift. 24. Bind. 10 



