— 165 - 



Punctariaceæ and place it near Litosiphon. The slight resemblance between 

 this species and Pylaiella littoralis does not show anything more than a 

 relation between the two families. 



E. I cel. Kolfreyjustaöur, Hölmanes. 

 NW. Icel.. Isafjöröur. 



SW. Icel. Hvammsfjöröur, Stykkishölmur; Reykjavik (Grönlund, CO); 

 Njarövfk (G. O.). 



S. Icel. Eyrarbakki, Vestmannaeyjar. 



Stictyosiphon tortilis (Rupr.) Rke. Atlas Tab. 31 — 32, Rosenv. Grl. 

 Havalg. p. 868. Phloeospora tortilis Strömf. Algveg. p. 51 ; Phloeospora 

 subarticulata Kjellman Ridrag p. 78. 



In pools and rocks in the lower litoral region and on stones and 

 other algæ in the upper sublitoral region down to a depth of c. 5 fathoms. 

 The largest specimens are 30 cm. long. Fructiferous specimens have been 

 met with in June— August. 



E. Icel. Berufjöröur, Vattarnes, Hölmanes. 



N. Icel. Grimsey (O. D.); Eyjafjöröur; Skagafjöröur (Strömfeit). 



NW. Icel. Broddanes; Dvrafjöröur (G. 0.). 



SW. Icel. Melar, Reykjavik. 



l'hæostroma pustulosum Kuckuck Ueber einige neue Phaeosporeen der 

 westl. Ostsee, Bot. Zeit. 1895, p. 182, 

 Taf. VII, Rosenv. Deux. Mem. p. 68, 

 fig. 15. 



I have met with this species in 

 the litoral region on Scytosiphon lo- 

 mentarius, Chorda tomentosa, Phyl litis 

 fascia and Laminaria saccharina f. phyl- 

 litis. I have also found it in the sub- 

 litoral region on young Laminaria sac- 

 charina in a depth of 3 — 4 fathoms. 



The plants I have referred to this 

 species are varying, especially regarding 

 the condition of the basal portion of 

 the frond. Specimens growing on 

 looser substratum, as the surface of 

 fructiferous Scytosiphon and Chorda, 

 have a basal portion consisting of free 

 filaments, whereas specimens growing 

 on firmer substratum, as the surface of 

 Laminaria, have a basal disc with mar- 

 ginal growth. 



Fig. 20. 



Phœostroma pustulosum Kuck. 

 a a vertical filament with a young 

 terminal plurilocular sporangium, 

 connected with a horizontal filament 

 (to right) bearing a young hair; 

 b fragment of a horizontal filament 

 with a plurilocular sporangium; c, a 

 horizontal filament with a hair, the 

 end of which (to right) is growing 



