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 Kj ell man’s report (1. c.) 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 different 
stations along the Faeroes; of f. angustata he has only Greenland 
specimens. 
This is a very common species of the Fseroese coast. Lyngbye 
mentions it as follows: — »Ad insulas Fseroenses in stipite Laminarise 
digitae haud rarus.« 
RHODOPHYLLIS Kutz. 
25. Rh. dichotoma (Lepech.) Gobi. Kjellm., N. I., p. 185 (144); 
Sphserococcus ciliatus Lyngb., Hydrophyt., p. 12. 
The typical form with the broad thallus 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. Kjellman (1. c. tab. 12, fig. 3) has figured such a plant; 
Lyngbye’s Herbarium contains similar specimens from Greenland 
which he has called 0 fuscus (Hydrophyt., 1. c.). 
In Epicrisis, p. 362, Agardh describes a var. atropurpurea of 
this species and reports it from the Fzeroes, and in the considerable 
Fseroese 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 
it very rarely at great depths growing on stones and shells. 
