Contribution. I. 19 



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

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

 traspores were pretty common at Vardo and Pasvig. It has 

 been 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 

 in rather large numbers. The plant seems to decrease in 

 number of individuals to the east. Although 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. 



Polysiphonia arctica J. G. Ag. 



Spec. Alg. 2, p. 1034. 

 Descr. Polysiphonia arctica J. G. Ag. 1. c. 



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



Exsicc. „ „ Arescb. Alg. Scancl. exsicc. No. 403. 



This plant is always sublitoral. I do not know how far 

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

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

 of Balanidse, sometimes to other algse, as Laminaria-roots 

 and Lithothamnia. It prefers stony or shingly bottom and 

 grows often together with Dichloria, generally in scattered 

 individuals. 



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

 Spitzbergen, judging from a few specimens I have seen from 

 there. The size is most commonly 8 — 15 cm., but I have met 

 with specimens which were even 30 cm. long. The pericen- 

 tral siphons are generally 6 in number, rarely 7, but often 



