439 
it occurs in the littoral zone, and has been met with near high- 
water mark, where it may often be found in a completely dried 
up state. 
It grows gregariously on rocks. 
It was gathered in May and October, well-developed specimens 
occurring in both these months. 
Fructifying plants were found in May. 
In Faer. FI. p. 86 Rostrup mentions a f. filiformis of Phyllitis fascia , 
but the specimen in his herbarium bearing this name has proved to 
be Ph. zosterifolia. 
It has hitherto been found in the following places only: — Vid.: 
Yiderejde (!); Ost.: Solmunde (H. J.); Str.: The east coast (Rostrup). 
SCYTOSIPHON (Ag.) Thur. 
127. S. lomentarius (Lyngb.) J. Ag. Kjellm., N. I., p. 320 (258); 
Chorda lomentaria Lyngb., Hydrophyt., p. 74. 
Specimens occurred both with and without constrictions. This 
species grows on rocks in the littoral zone and is met with in 
sheltered but more especially in exposed localities. In the latter 
it can occur fairly near high-water mark (e. g. in much exposed 
localities near Mjovenaes [Ost.], and on Myggenaes it grew near 
or even somewhat above high-water mark) where it grows by pre¬ 
ference in slight depressions in the rock containing a little water 
left by the receding tide, but it also occurs on sloping rock surfaces 
where it is left quite dry. In sheltered localities where tides are 
not felt it grows in shallow water, especially on stony bottoms. 
It may extend far into the fjords and can bear a strong admixture 
of fresh-water. 
In Vaagfjord it was found epiphytic on Zoster a. 
Specimens gathered in April were still sterile. Fructifying plants 
were found in May, June, July and it doubtless keeps on fruc¬ 
tifying till late in autumn. 
This species is extremely common along the coasts of the Faeroes, 
as was pointed out by Lyngbye: — »Habitat in infimo refluxus limite 
ad littora Faeroensia, ut ad Qvivig, copiose«. 
LITOSIPHON Harv. 
128. L. Laminariae (Lyngb.) Harv., Manual of the Brit. Mar. Alg., 
p. 43; Bangia Laminariae Lyngb., Hydrophyt., p. 84. 
This species grows on the leaves of Alaria esculenta , in the 
tissue of which the creeping filaments occur, and it frequently forms 
