$Q M. Foslte. 



Syn. Conferva dichotoma Gunn. Fl. Norv. 2, p. 105. 

 „ elongata „ „ 2, p. 116. 



Fucus flagelliformis Wg. Fl. Lapp. p. 505. 



All the specimens that I have examined are referable 

 to the typical form. However I have seen forms sometimes 

 approaching f. ramusculifera K j e 1 1 m. and sometimes f. sub- 

 simplex Kjellm. The last named form has been collected 

 at Loppen in West-Finmarken. 



The species is litoral and sublitoral. In the former zone 

 it occurs on rocks and stones, in rock-pools, or fastened to 

 other algae, chiefly Fucus serratus and Halosaccion ramenta- 

 ceum. At some places, for inst. Svserholt and Pasvig, it forms 

 a pretty broad border in the lowermost part of the zone, so 

 as to determine essentially the character of the vegetation. 

 In the sublitoral zone, where it seems to be less common 

 than in the litoral one, it is fastened to other algse or stones, 

 and descends to a depth of about 10 fathoms. I sometimes 

 have met with stems of Laminaria hyperborea and L. digitata 

 quite invested with this plant. It appears on open as well 

 as sheltered coasts, but it seems to thrive best in rather 

 exposed places. Specimens bearing zoosporangia have been 

 collected in the later half of June, in July and August. 



Distribution: Common and abundant almost everywhere. 



Gen. Eudesme J. G. Ag. 



Alg. Syst 2, p. 28. 



Eudesme vires cens (Carm.) J. G. Ag. 

 1. c. p. 31; Mesogloia virescens Carm. in Hook. Brit. Fl. 2, p. 387. 

 Descr. Eudesme virescens J. G. Ag. 1. c. 



Mesogloia virescens J. G. Ag. Spec. Alg. 1, p. 56. 

 Fig. n „ Harv. Phyc. Brit. t. 92. 



„ „ „ Ner Am. 1, t. 10, fig. b. 



Exsiec. Castagnea virescens Aresch. Alg. Scand. exsicc. No. 315. 

 (Syn. Castagnea virescens Kleen, Nordl. Alg. p. 34. 



„ Zosterce Kleen, 1. c.j sec. Kjellm. 1, c. p. 318, 



