721 



sloping rocks and especially recesses in Ihese rocks that may be 

 reached by the sea. In much exposed piaces this formation may 

 extend far above Ihe highest water mark, and the algæ growing 

 here are consequently in danger of being dried up for rather a 

 long time; this they, however, greatly avoid by means of their low, 

 tufthke growth, and especially by their great amount of mucus, 

 in which Fiiciis iuflatiis f. disticha is particularly rich. 



Fig. 153. Fucus spiralis f. 



steep rocky coast near Viderejde. 



The formation is typically formed by two species of Fiicus, 

 that is, Fucus spiralis f. nana and Fucns inflatus f. disticha. Fucus 

 spiralis grows uppermost, often a couple of feet higher up than Fucus 

 inflatus. They almost always grow together, but as Fucus spiralis 

 seems to be able to stand being dried up better than Fucus inflatus, 

 the former is found in somewhat more sheltered piaces, where the 

 sea may happen to be calm for some length of time. On the 

 other band, it is most often only Fucus inflatus f. disticha which is 

 found in particularly exposed piaces, and which seems thus to be 

 the best fitted for resisting the surf. I have found vigorous specimens 

 of it, 2—4 inches long, on Myggenæs Holm and Muletangen at 



