751 



rallina is however often replaced by the above-mentioned Phyma- 



tolithon polymorphiim-assoc'ialion. 



Like the littoral Cora //zno-formation, the subHttoral shelters a 



great many difTerent algæ, either epiphytically on the Corallina, or 



on the rock among the hitter. Some of these are e. g. Chondrus 



crispiis, Delesserin alata, D. siniiosa, Chætomorpha Melagoniuni, Lo- 



mentaria ckwellosa, Ptilota phimosa, Porphijra leucosticta, P. miniata, 



etc. In smaller group of rocks, where the habitat is somewhat shel- 



tered but the coast still exposed, e. g. on the east coast of Stromo, 



from the redoubt near Thorshavn northward, to Hvidenæs, or at 



Ejde on Naalso, large associations of the gregarious Fiircellaria fa- 



stigiata are often found in the Co/'a//ma-formation, besides large or 



small associations of Ahnfeltia plicata. A conimon epiphyte on the 



Corallina in these piaces is Ceramhim riibrum siibf. seciindata. Ulua 



Lactiica and Monostroma fiisciim are likewise found here. The Co- 



rrt///na-formation is moreover partly the subvegetation of the Alaria- 



association. 



The Laminar iaceæ-Formation. 



This, the most widely distributed formation on the coasts of the 

 Færoes is naturally divided into several well-defined associations. 

 On an exposed coast, the A/orfa-association is uppermost, which is 

 sometimes replaced by a Laminaria digitata-a.ssociaiion; a Laminaria 

 safr/zrt/zVjrt-association is more seldom found, and lowest of all a 

 L. hyperboreaassocial'ion. On a sheltered coast we moreover fmd a 

 Laminaria /"æroens/s-association , but of this and the Laminariaceæ- 

 formation as a whole we will give further details later on. 



This La/nznanaceæ- formation corresponds with Kjell man 's 

 Laminariaceen-formation (45, p. 34). 



The Laminaria digitata- Association. 



This association, which gradually merges into the Laminaria 

 hyperborea-assoc'iai'ion, growing below it, is found on open coasts on 

 slightly sloping rocks. In localities where the sea is particularly 

 turbulent and therefore constantly washing the rocks, this association 

 may reach to several feet above the lowest water mark. On the 

 Southern and eastern coasts of Sydero, from Sumbo Holm to Vaag- 

 fjord, and on Vaago and Troldhoved on Sando, I have seen this 

 association beautifully developed (see plate XX). 



The Laminaria digitata is well adapted to resist the violence of 

 the waves. Bolh leaf and stalk are of a tough, yet pliable character 



