— 160 



Pericysts are abundantly occurring in my specimens, but I have never met 

 with hairs. The unilocular sporangia are usually sessile and resemble 

 precisely the figures given by Reinke (1. c.) and Kuckuck (1. c), but stalked 

 sporangia are also occurring, as pointed out by Kuckuck and Sauvageau. 

 It was gathered with unilocular sporangia in December and June. 



The species occurs in the upper litoral region often in company with 

 S. britannica, but I have also met with it in a depth of 3 — 4 fathoms. 



E. I cel. Eskif'jöröur (Strömfeit). 



N. Icel. Arnarnes (O. D.). 



NW. Icel. Broddanes. 



SW. Icel. Reykjavik; N.jarövi'k (CO.). 



S. Icel. Vestmannaeyjar. 



Sphacelaria olivacea Pringsh., emend. Sauvag. Sphacelaria p. 54. 

 I have met with some specimens of a Sphacelaria growing epiphyti- 

 cally on the stem of Laminaria hyperborea. They were all sterile and 

 without propagulæ. The basal portion is a disc with marginal growth 



(Fig. 17, a) consisting of several 

 layers of cells (Fig. 1 7, b, c). Hairs 

 are absent, and I have only seen 

 some few large cells of the same 

 colour as the other cells, which 

 I think may be regarded as peri- 

 cysts. The erect filaments are 

 20 — 30 fx thick, and bear only 

 some few branches. I have re- 

 ferred my specimens to S. olivacea 

 Pringsh. on account of the struc- 

 ture of the basal disc. Regarding 

 the divisions of the pericentral 

 cells they also agree with the 



Fig. 17. Sphacelaria olivacea Pringsh. 

 compare the text, a 126 : 1 ; b, c 215 : 1, 



figures given by Sauvageau. As all my specimens are sterile and seem 

 to be in younger stages of age, my determination is probably doubtful. 



NW. Icel. Dyrafjöröur (CO.). 

 SW. Icel. Einarslön. 

 S. Icel. Vestmannaeyjar. 



Chætopteris plumosa (Lyngb.) Kiitz., Sauvag. Sphacelaria p. 144 ; Strömf. 

 Algveg. p. 52, Rosenv. Grl.Havalg. p. 903, Reinke Atlas Tab. 49 — 50. 



I have met with this species at low-water mark and down to a depth 

 of 10 fathoms. Most of my plants were gathered in the summer, and 

 are sterile. Specimens having unilocular and plurilocular sporangia were 

 gathered in January by 0. Davi'össon at Gâsir and Arnarnes in Eyjafjöröur. 



