112 M. Foslie. 



na of Laminaria digitata, on a somewhat exposed locality, 

 together with Isthmoplea sphcerophora, Ectocarpus confervoi- 

 des and Pylaiella litoralis. It has been taken with reproduc- 

 tive organs at the end of May, and in the middle of June 

 and July. 



Distribution: Found only at Mehavn, At the end of 

 May, 1882, and in the middle of June, 1887, local but abun- 

 dant. In the middle of July, 1889, very rare. 



Pylaiella litoralis (L.) Kjellm. 

 Skand. Ect. och Tilopt. p. 99; Conferva litoralis L. Spec. Plant, p. 

 1165; ex parte. 



Descr. Pylaiella litoralis Kjellm. 1. c. 

 Fig. Ectocarpus litoralis Harv. Phyc. Brit. t. 197. 

 „ „ Kiitz. Tab. Pbye. 5, t. 76. 



„ compaetus Kiitz. 1. e. 



Spongonema castaneum Kiitz. 1. c.. . 83. 

 Exsicc. Ectocarpus firmus Arescli. Alg. Scand. exsico. Nr. 24. 

 „ „ var. rupincola Areseh. 1. e. Nr. 113. 



„ „ f. vernalis Arescli. 1. c. Nr. 173. 



Syn. Conferva litoralis Wg. Fl. Lapp. p. 513; ex parte. 



This plant does not appear in as many forms as farther 

 south, though also here much varying. It is litoral, some- 

 times descending into the sublitoral zone, but only in inferior 

 depths. It is mostly fastened to other algse, as Fucacece, but 

 also to rocks or stones and woodwork. I have even seen 

 it attached to crabs and fishes (Cyclopterus). It bears zoo- 

 sporangia in June, July and August, and gametangia in June 

 and July. At Nordland I have taken zoospore-bearing spe- 

 cimens in the middle of December. 



Distribution: Common and abundant everywhere. 



Pylaiella macrocarpa Fosl. 



in Tromso Mus. Aarsh. 10, p. 179 

 Descr. Pylaiella macrocarpa Fosl. 1. c. 

 Fig. „ „ „ „ t. 2, fig. 13-15. 



