12' M. -^oslte. 



But only this species has been found on the mentioned host 

 plant in Nordland and at Iceland. 



Distribution : Only found at Kiberg in Varanger, very 

 rare. 



Fara. R-hodomelacese J. G. Ag. 



Symb. p. 23 ; Spec. Alg. 2, p. 787. 



Gen. Odonthalia Lyngb. 

 Hydr. Dan. p. 9. 



Odonthalia de'ntata (L.) Lyngb. 



1. c. Fucus dentatus L. Mant p. 35. 

 Descr. Odonthalia dentata J. G. Ag. Spec. Alg. 2, p. 899. 

 Fig. „ „ Harv. Phyc. Brit. t. 34. 



Exsicc. „ „ Alg. Scand. exsicc. Nr. 56. 



Syn. Fucus dentatus Gunn. Fl Norv. 2, p. 91. 

 „ pinnatifidus Gunn. 1. c. p. 104. 



Also at East-Finmarken occur two forms of this species, 

 one with broader, the other with narrower frond, f. angusta 

 Harv., but as stated by Kjellman they run so gradually in- . 

 to each other that no limit can be drawn between them. 

 The former occosionally grows on open shore and the latter 

 in the interior of deeper bays, or on sheltered places. At 

 Kirkenses in Sydvaranger I met with a form which had a 

 thread-narrow frond, but also this seems to run into the 

 narrow one mentioned above, and may be regarded only as 

 a local variety. As well known, several pelagic algae get 

 a form more or less differing when they enter into deep 

 bays or grow on much sheltered localities. 



The species in question is sublitoral anl occurs on a 

 depth of 3 — 20 fathoms, on various bottom. It seems to. 

 be. .best developed on stony, shelly or gravelly bottom on a 

 depth of 6—12 fathoms, and then commonly growing toge- 



