— 170 — 



Dictyosiphon foeniculaceus (Huds.) Grev., Kjellm. Arct. Alg. p. 269; 

 Rosenv. Grl. Havalg. p. 859 ; Strömf. Algveg. p. 52. 



This species belongs to the litoral region, where it grows on stones 

 and other algæ, e. g. Chordaria flagelliformis. It attains a length of up 

 to 40 cm. I have met with fructiferous specimens in July— August. 



f. typica, the most common form, is probably common at the Ice- 

 landic shores. 



f. flaccida Aresch. is known from only 3, far distant places : Hölmanes 

 in E. Icel., Isafjöröur in NW. Icel. and Stykkishölmur in SW. Icel. 



E. Icel. Berufjöröur, Reyöarfjöröur, Seyöisfjöröur. 



N. Icel. Grjötnes (CO.); Gnmsey (O. D.) ; Eyjafjöröur. 



NW. Icel. common. 



SW. Icel. Stykkishölmur; Reykjavik (CO.). 



Fam. Desmarestiaceæ. 



Desmarestia viridis (Müll.) Lam., Rosenv. Grl. Havalg. p. 859; Dichloria 

 viridis Strömf. Algveg. p. 51. 



It belongs to the sublitoral region, where it is found down to a depth 

 of 20 fathoms, often in company with Desmarestia aculeata, but it also 

 occurs at low-water mark. In May I met with young specimens, growing 

 on Laminaria species at Vestmannaeyjar in S. Icel. Specimens furnished 

 with hairs were found in May— August. It attains a length of 40 cm. 



Probably common. 



E. IceL Djupivogur, Vattarnes. 



N. Icel. Eyjafjöröur; Skagafjöröur (Strömfeit). 



NW. Icel. common. 



SW. Icel. Gustsey, Stykkishölmur; Reykjavik (CO.). 

 S. Icel. Vestmannaeyjar. 



Desmarestia aculeata (L.) Lam., Strömf. Algveg. p. 51 ; Rosenv. Grl. 

 Havalg. p. 857. 



This species belongs to the sublitoral region, where it has been found 

 down to a depth of 20 fathoms. Usually it is found scattered below the 

 Laminaria-zone. It is also, but rarely, found in the lower part of the 

 litoral region. Specimens furnished with hairs have been met with in 

 March— July. In the first half of October 1897 I found in Reykjavik speci- 

 mens bearing unilocular sporangia of the same appearance as figured by 

 Kuckuck (Bemerkungen I, p. 247). There were moving spores in great 

 quantities. The frond attains a length of 150 cm. 



Common everywhere on the coasts. 



