— 154 — 



E. I cel. Berufjöröur. 



N. I cel. Grimsey (0. D.) ; Eyjafjöröur. 



NW. I cel. Hrütafjöröur, Kollafjöröur. 



This multiform species is exceedingly common along the coasts of 

 Iceland, growing on rocks or on other algæ, usually Fucaceæ, in the litoral 

 region, and it is also met with in the upper sublitoral region. It has been 

 gathered with unilocular and plurilocular sporangia in April— October. 



Ectocarpus tomentosoides Far]. New or imperfectly known algæ of 

 U. S., reprint from Bull. Torr. Bot. Club. Vol. XVI, 1889, p. 11, Tab. 87, 

 fig. 4; Rosenv. Grl. Havalg. p. 180; Gran: en norsk form af Ectoc. tomen- 

 tosoides Farl. Christiania Vidensk. Selsk. Forhandl, for 1893, No. 17; 

 Kuckuck Ueber Polymorphie bei einigen Phaeosporeen in Festschrift für 

 Sch wendener p. 370, fig. 5 — 7. 



I have found this species in the lamina and the stipe of Laminaria 

 hyperborea and Laminaria digitata, in the stipe of Alaria esculenta, and 

 further more in old specimens of Rhodymenia palmata, where it was 

 growing amongst Myrionemaceæ. The species is very gregarious, especially 

 in the lamina of the named Laminaria species, and it covers the host plant 

 with a dense matted growth. When in the „Phycocelis stage" (cfr. Kuckuck 

 1. c. fig. 5), it is to be found in more scattered, æcidioid patches in the 

 lamina. The vertical filaments attain a length of 1 cm. and a thickness 

 of 7 — 9/i. As in the Færoes (Börgesen, Fær. Alg. p. 415) it attains its 

 highest development at the Icelandic coasts in the first spring months. 

 When I came to Reykjavik in the middle of March 1897, I found it gro- 

 wing most vigorously, with long erect filaments, and precisely resembling 

 Kuckuck's figure (1. c. fig. 6). Till the middle of May it was to be found 

 most gregarious everywhere in S.- and SW. Iceland. In E. Iceland I met 

 with it in August in the „Phycocelis stage" and with some few, poorly 

 developed erect filaments. On the NW.-coast I found it in the beginning 

 of September growing in Rhodymenia with well developed erect filaments 

 having for the most part emptied plurilocular sporangia. 



Gathered with plurilocular sporangia in March— June and August— 

 September. Unilocular sporangia fully agreeing with Gran's figures and 

 description (1. c.) occurred abundantly in well developed specimens at 

 Reykjavik in April. 



E. I c el. Berufjöröur, Seyöisfjöröur. 



NW. I cel. Kolbeinsâ, Isafjöröur (G. O.) ; Önundarfjöröur, Arnarfjöröur. 

 SW. Icel. and S. Icel. common. 



Ectocarpus tomen tosus (Huds.) Lyngb. Hydr. Dan. p. 132. Kjellm. 



Handbok p. 73. 



This species is only met with in SW.- and S. Icel., growing on Fucus 



