— 170 — 



Dit'tjosiphon foeniciilaceus (Huds.) Grev., Kjellm. Arct. Alg. p. 269; 

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



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

 and other algae, e. g. Ghordaria flagelliformis. It attains a length of up 

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



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

 landic shores. 



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

 in E. Icel., IsafjorOur in NW. Icel. and Stykkisholmur in SW. Icel. 



E. Icel. BerufjcirOur, ReyOarfjorOur, SeyOisfjorOur. 



N. Icel. Grjotnes (G. 0.) ; Grfmsey (0. D.); EyjafjorOur. 



NW. Icel. common. 



SW. Icel. Stykkisholmur; Reykjavik (G. 0.). 



Fam. Desmarestiaceae. 



Desiniirestia viridis (Miill.) Lam., Rosenv. Grl. Havalg. p. 859; Dichloria 

 viridis Stromf. 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. EyjafjorOur; SkagafjorOur (Stromfelt). 



NW. Icel. common. 



SW. Icel. Gustsey, Stykkisholmur; Reykjavik (G. 0.). 



S. Icel. Vestmannaeyjar. 



Desmarestia aculeata (L.) Lam., Stromf. 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. 



Gommon everywhere on the coasts. 



