Contribution. 1 105 



The present plant is litoral, living in rock-pools in the 

 upper part of the zone, and appears only on open coasts. 

 It bears zoosporangia in the middle of July. 



Distribution: Found at Mehavn, scarce, at Berlevaag, 

 local but abundant, and at Ekkero, scarce. 



Dictyo siphon hippuroides (Lyngb.) Kiitz. 



Tab. Phyc. 6, p. 19; Scytosiphon hippuroides Lyngb. Hydr. Dan. p. 63. 

 Deser. Dictyosipbon bippuroides Aresch. Obs. Pbyc. 3, p. 26. 

 Fig. „ „ kiitz. 1. c. t. 52. 



Exsicc. n „ Aresch. Alg. Scand. exsicc. No. 105, 320, 



321. 



Syn. Dictyosiphon foeniculaceus « Aresch. Phyc. Scand. p. 147. 



This species is chiefly litoral, usually living in rock-pools 

 fastened to stones, or, more often, epiphytic on other algae, 

 principally Chordaria flagelliformis and Fuci, sometimes also 

 JRhodymenia pdlmata and Halosaccion ramentaceum. It occurs 

 on open as well as sheltered coasts. Specimens bearing 

 zoosporangia have been taken in June, July and August. 



Distribution: Common and abundant almost everywhere. 



Dictyosiphon foeniculaceus (Huds.) Grev. 

 Alg. Brit. p. 56; Conferva foeniculacea Huds. Fl. Angl. p. 164. 



f. typica. 



Deser. Dictyosiphun foeniculaceus Aresch. Obs. Phyc. 3, p. 30. 



Fig. „ a „ Phyc. Scand. t. 7. 



Exsicc. „ „ „ Alg. Scand. exsicc. No. 103, 319. 



f. flaccida Aresch. 

 Bot. Not. 1873, p. 137 

 Deser. Diciyoeij'hon foeniculaceus var. fiaccidus Aresch. Obs. Phyc. 3, p. 31. 

 Syn. Scytosiphon foenisulaceus Lyngb. Hydr. Dan. p. 63; ex parte. 

 Dictyosiphon foeniculaceus p Aresch. Phyc. Scand. p. 148. 



The form flaccida is, in the Norwegian Polar Sea, a well 

 differentiated form. Its zoosporangia are generally larger 

 than by the typical form, their long axis attains sometimes 

 even 110 jj.. At Tromso occurs a very coarse form, most 



