Contribution. I. 21 



Gen. Polyides Ag. 

 Spec. Alg. 1, p. 390. 



Polyides rotundus (Gmel.) Grev. 



Alg. Brit. p. 70; Fiicus rotundus Gmel. Hist. Fuc. p. 110. 

 Descr. Polyides lumbricalis J. G. Ag. Spec. Alg. 2, p. 721. 

 J?ig. Polyides rotundus Harv. Phyc. Brit. t. 95. 

 Exsicc. „ „ Aresch. Alg. Scand. exsicc. No. 252. 



Syn Fucus caprinus Gunn. Fl. Norv. 1, p. 96 et in Act Nidros. 



p. 82. 

 Furcellaria rotunda Sommerf. in Act. Nidros. p. 51. 



This alga is chiefly litoral, growing on rocks at low- 

 water mark, or in rock-pools, but it also occurs in the up- 

 per part of the sublitoral zone, on a depth of about 4 fathoms. 

 The specimens are small and often rather slender, but still 

 they approach most nearly the typical form. I have taken 

 specimens bearing tetraspores at the end of June. 



Distribution: Scattered and scarce along the open shore, 

 and not met with in the inner part of the great fjords. 



Fam. Delesseriacese J. G\ Ag. 



Epicr. p. 444. Cfr. Alg. med. p. 155. 



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

 Epicr. p. 477; Lamour. Ess. p. 122; ex parte. 



Delesseria alata (Huds.) Lamour. 



Ess. p. 124; Fucus alatus Huds. Fl. Angl. p. 578. 

 Descr. Delesseria alata J. G. Ag. Epicr. p. 483. 

 Fig. „ „ Harv. Phyc. Brit. t. 247. 



Exsicc. „ „ Aresch. Alg. Scand. exsicc. No. 75. 



Syn. Delesseria alata Kleen, Nordl. Alg. p. 14. 



„ „ var. augustissima Kleen 1. c? 



„ angustissima Kjellm. Ish Algfl. p. 172? 

 Fucus alatus Gunn. Fl. Norv. 2, p. 91. 

 „ „ Wg. Wg. Fl. Lapp. p. 492. 



