112 



*i, f 



M. Fostic. 



na of Laminaria diyitata^ on a somewhat exposed locality, 

 together with Isthmoplea sphærophora, Ectocarpiis confervoi- 

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

 tive organs at the end o£ May, and in t!;ie middle of June 

 and July. 



Disiribution: Found only at Mehavn. At the end of 

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



r 



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



Pylaiella litoralis (L.) Kjellm. 



Skand. Ect. ocli Tilopt. p. 99; Couferva litoralis L. Spee. Tlant 



1165; ex parte. 



Descr. Pylaiella litoralis Kjellm. 1. c. 



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



„ „ Kiitz. Tab. Pliye. 5, t. 76. 



„ conjpaetus Kiitz. 1. c. 



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

 Exsicc, Ectocarpus firmus Årcscli, Alg. Scand. exsiao. Nr. 24. 



„ var. rupincola Arcsch. 1. c. Nr. 113. 

 f. vernalis Arcsch. 1. c. Nr. 173« 



P- 



n 



w 



w 



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



ri 



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 algæ, as Fucaceæ, but 

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

 it attached to crabs and fishes (Cy dop ter us). It bears zoo- 

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

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

 cimens in the middle of December. 



Distribufion: Common and abundant everywhere. 



Pylaiella macrocarpa Fosl. 



in Tromso Mus. Aarsli. 10, p. 179 



Descr, .Pylaiella macrocarpa Fosl. L c. 



Fig. 



y> 



n 



» 



)). 



t. 2, flg. 13-15. 



i 



