iltribution. L 



118 



TLis species is nearly related' to-certain forms oi Py lai- 

 ella litoralis. It differs by its long chains of zoosporangia 

 and very long gametangia, the former in a number of until 

 40, the latter 180—1320 ji long, and by the subsecund bran- 

 ches of the last and the last but one order, the latter raost- 

 ly issuing in pairs. '' 



The plant is litoral and sublitoral. In the former case 



^owing in rock-pools fastened to Laminaria digitata. In the 

 latter case attached to the stipe of Alaria on a depth of 

 2— 5'få%homs. n bears zoosporangia in June. At Tromso 

 I have coUected specimens with zoosporangia and gametanp-ia 

 m the beginuing of August They have sometimes beenfound 

 in one and the same individual, or even joining each other. 

 Distr ihution: Fonnd at KjoUefjord, scarce, and at Me- 



havn, rare. 



Pylaiella varia Kjellm. 



K Ish. Algfi. p. 348. 

 Descr. Pylaiella varia Kjellin. 1. c. 



t. 27, 



Qg. 1-13 



Sublitoral, occurring on a depth of 2—5 fathoms. Spe- 

 cimens tåken in the middle of June were sterile. I have col- 

 lected zoospore-bearing ones at Tromso in the beginnino- of 

 September, ia rock-pools betvveen tides among other alo-æ. 



Bistribution: Fonnd only at KjoUefjord, rare. 



y 



Ser. ChlOropliyceæ (Rabenh.) Wittr. 



Fithopli. p. 42; Rabeuli. ¥\. Eur. Alg. 3, p. 1; lim. mut. 



Fam» Ulvaceæ (Ag.) Ilke. 



I 



Ostseefl. p. IX; Ag. Syst. Alg. p. XXX; lim. mut. 



T B 



Gen. Monostroma (Thur.) Wittr. 



Monostr. p. 15; Tliur. Note s. Ulv. p. 21), sec. Wittr, 1. c; lim. mut, 



8 





