362 



the open sea as well as in sheltered localities. in the latter often 

 in its narrow form as mentioned above. 



Occurs most frequently epiphytic, especially on the haptera 

 and lower part of the stem of Laminaria hyperborea, but also found 

 now and then attached to rocks. 



Found bearing tetraspores in June, July, August; and cysto- 

 carps in May, June, July, August and November. This seems to agree 

 with Kjell mans report (le.) from the Arctic Sea that it appears 

 to be able to form cystocarps all the year round, but tetraspores 

 chiefly during summer. 



In Lyngbye's Herbarium there are specimens from dilTerent 



stations along the Færoes; of f. angustata he has only Greenland 



specimens. 



This is a very common species of the Færoese coast. Lyng b ve 

 mentions it as follows: — »Ad insulas Færoenses in stipite Laminariæ 

 digitæ haud rarus> 



RHODOPHYLLIS Kutz. 



25. Rh. dichotoma (Lepech.) Gobi. Kjellm., N. I., p. 185 (144); 

 Sphærococcus eiliatus Lyngb., Hydrophyt., p. 12. 



The typical form with the broad thailus occurs in the open 

 sea, but in the interior of fjords in quiet water it alters its appear- 

 ance, the branches getting narrow and ribbon -like, often almost 

 filiform. Kjell man (1. c. tab. 12, fig. 3) has figured such a plant; 

 Lyngbye's Herbarium contains similar specimens from Greenland 

 which he has cailed fuscus (Hydrophyt., 1. c). 



In Epicrisis, p. 362, Agardh deseribes a var. atropurpurea of 

 this species and reports it from the Færoes, and in the considerable 

 Færoese material of this species which I have had at my disposal 

 I found a few specimens which agreed fairly well with his de- 

 scription of this variety, but as they form together with the rest of 

 my material a continuous series, it is impossible to mark the di- 

 viding line for this variety. I am therefore of opinion that var. 

 atropurpurea can hardly claim to be ranked as a variety. 



This species grows in the sublittoral zone in deep water and 

 has been found down to a depth of 25 fathoms. It inhabits more 

 particularly the open sea, but may also be met with in the interior 

 of fjords. It occurs most frequently epiphytic especially on the 

 haptera and lower part of the stem of Laminaria hyperborea. I found 

 il very rarely at great depths growing on stones and shells. 



