751 



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

 tolithon poli}morj)hiim-£issoc'ia[[on. 



Like the httoral Cora //z/K/-formation, the sublittoral shelters a 

 great many dilTerent algae, either epiphytically on the CoralUna, or 

 on the rock among the latter. Some of these are e. g. Clwndrus 

 crispiis, Delesseria alata, D. siniwsa, Chcetomorpha Melagoniuni, Lo- 

 mentaria clavellosa, Ptilota phiinosa, Porphijra leiicostida, P. miniata, 

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

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

 from tlie redoubt near Thorshavn northward, to Hvidenses, or at 

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

 stigiata are often found in the Cora////?a-formation, besides large or 

 small associations of Ahnfeltia plicata. A common epiphyte on the 

 Corallina in these places is Ceramiiim ruhrum subf. setiindata. Ulva 

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

 rallina-formaiion is moreover partly the subvegetation of the Alaria- 



association. 



The Laminariacece- Formation. 



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

 Faeroes is naturally divided into several well-defined associations. 

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

 sometimes replaced by a Laminaria c//^z7a/a-association; a Laminaria 

 saccharina-Sissoc'miion is more seldom found, and lowest of all a 

 L. hyperborea-associsiiion. On a sheltered coast we moreover find a 

 Laminaria /beroe/^szVassociation , but of this and the Laminariacece- 

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



This La/izznanacecp- formation corresponds with Kj ell man's 

 Laminariaceen-formation (45, p. 34). 



The Laminaria digitata- Association. 



This association, which gradually merges into the Laminaria 

 hyperborea-sissocisiiion, 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. Both leaf and stalk are of a tough, yet pliable character 



