721 



sloping rocks and especially recesses in these rocks that may be 

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

 extend far above the highest water mark, and the algae 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% 

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

 in which Fiicus inflatiis f. disticha is particularly rich. 



^ijd^^^r vf "^^ 



: -■ J- .> v.v I 



1*1 



■mm 



Fig. 153. Fucus spiralis f. nana and, below, Fucus inftatus f. disticha on steep rocky coast near Viderejde. 



(F. B. phot.). 



The formation is typically formed by two species of Fucus, 

 that is, Fucus spiralis f. nana and Fucus inftatus f. disticha. Fucus 

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

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

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

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

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

 other hand, it is most often only Fucus inftatus f. disticha which is 

 found in particularly exposed places, 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 Myggenaes Holm and Muletangen at 



