7g M. Foslie. 



Stipes' length. Length of lamina. Breadth of lamina. 



0.5 cm. 2 cm. 1 cm. 



Unfortunately, I have not examined the structure by 

 living specimens, and having alcohol-materials only of f. 

 oblonga, I cannot at present decide the mutual connection in 

 this respect between the two forms and their relation to Ph. 

 lorea (B o r y) K ] e 1 1 m. 



Ph. dermatodea is a pelagic alga, best developed on open 

 coasts. In much exposed places it becomes very narrow (f. 

 lanceolata), analogous to other Laminar iacece, for inst. L. sac- 

 charina, but contrary to several other algae, as Odonthalia 

 dentata, Mhodophyllis dichotoma, Phyllitis fascia, which get 

 narrow in much sheltered localities, or in the interior of 

 deep bays. In less exposed places, on the other hand, or in 

 deeper water, Ph. dermatodea becomes shorter, with propor- 

 tionally much broader lamina, and here it often also gets 

 a little darker (f. oblonga). The former grows in the upper- 

 most part of the sublitoral zone, and sometimes also in rock- 

 pools in the lower part of the litoral zone, the latter only 

 in the sublitoral zone and generally on a depth of 5 — 10 

 fathoms. Specimens collected in June, July and the earlier 

 half of August were sterile. 



Distribution; Common and rather plentiful all along the 

 open coast, at some places abundant, and entering pretty far 

 into the deeper bays. 



Gen. Laminaria (Lamour.) J. G. Ag. 



Lam. p. 7; Lamour. Ess. p. 40; char. mut. 



Laminaria saccharina (L.) Lamour. 

 Essai p. 32; Fucus saccharinus L. Spec, plant. 2, p. 1161. 



f. linearis J. G. Ag. 

 Lam. p. 12. 

 Descr. Laminaria saccharina a linearis J. G. Ag. 1. c. 



„ „ f, linearis Fosl. Lam, Norw. p. 95. 



