76 



M. P^osiie. 



^-^^^J^iS_ 





:Stipps' lengtli. 

 0.5 cm. 



Lcngth of lamina. 



2 cm. 



Breadtli of lamina. 



1 cm.' 



V !^ I 



-r ^ ^ \ . 



Unfortunately, I have not examined the structure by 

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



, I cannot at present decide the mutual conncctipn i|i 

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



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



Fh. ^epnatodca is a pelagic alga, best developed on open 



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



lanceolata)j analogous to other Laminariacece, for inst. L, sac- 

 charinay but contrary to several other algæ, as Odonthalia 

 dentata, RhodojjJiyllis dichotoma, PhyUiUs fascia, which get 



r 



narrow in rauch sheltered localities, or in the interior of 



Æ 



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

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



-x 



tionally much broader lamina, and here it often also gets 



F 



a little darber (f. ohlonga). 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 



ri 



fathoms. Specimens collected in June, July and the earlier 



half of August were sterile. 



Distrihution: Common and rather plentiful all along the 

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

 yif,p the deeper bays. 



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



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



Laminaria saccharina (L.) Lamour- 



Essai p. '32; Fucus saccharmus L. Spee. plant. 2, p. ll(il, 



f. Unearis J. G. Ag. 



Lam. p. 12. 

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



. ,, L linearis .FohI Lam, Korw. p. 95, 



v 



i I 



\ 





.,1, 



