■^-■^■^ 



Contribution. 1. 



19 



t 

 fi 







the specimens I have exarained in June and July were sterile. 

 But in the earlier half of August individuals with young te- 

 traspores were pretty oommon at Yardo and Pasvig. It has 

 heen found with reproductive organs at West-Finmarken in 

 July, August, September, October, and in Tromso amt from 

 June to November, most richly in September. Thus it might 

 seem that this alga here develops its reproductive organs 

 somewhat later in the year than at West-Finmarken and 

 farther to the south. 



Distribution: Pretty common everywhere along the open 

 coast. It does not enter as far into the great bays as 

 the host plant. Yet it occurs even at Lebesby in Laksefjord 

 lu rather large numbers. The plant seems to decrease in 

 number of individuals to the east. Althougb it appears abun- 

 dant on some localities even as far east as at Pasvig, still it 

 IS less commonly distributed in the eastern than in the western 

 part of the district. 



l' 



Polysiphonia arctica J. G, Ag. 



Spee. Alg, 2, p. 1034. 

 J)escr. Polysiphonia arctica J. G. Ag. 1. c. 



Exsi 



ICC. 



» 



n 



» 



» 



Gobi, Algenfl. Weiss. Meer. p. 26. 

 Arescli. Alg. Scand. exsicc. No. 403, 



This plant is always sublitoral. I do not knowhow far 

 it descends. On the places I met with it, it grew on a 

 uepth of 3—10 fathoms, sometimes fastened to stones or shells 

 ^i Balanidæ, sometimes to other algæ, as Laminaria-Toots 

 and Lithothamnia. It prefers stony or shingly bottom and 

 grows often together with Dichloria, generally in scattered 

 individuals. 



The plant seems bere to be coarser than for inst. at 

 Spitzbergen, judging from a few specimens I have seen from 

 ^We. The size is most commonly 8—15 om., but I have met 

 ^th specimens which were even 30 om. long. The pericen- 

 *^ale siphons are generally 6 in number, rarely 7, but often 



V 

 i 



\ 



