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become scattered, and much less densely placed. The unilocular sporangia 

 are sessile, or have a short stalk; they are sometimes found terminal on 

 the shorter branches. This species is, as well known, richly corticated 

 at the base, and below the fascicles of the branches a mantle of descend- 

 ing filaments, surrounding the main axis, is not rarely found. 



1 have also sometimes met with plurilocular sporangia arising from 

 the rhizoides as mentioned by Sauvageau (Sur quelques Algues phéospo- 

 rées parasites, Journal de Botanique, 1892) and Börgesen (Fær. Alg.). 

 The cells in the lower part of the main axis usually had spirally twisted 

 chromatophores. 



The species is only found in SW. Iceland and S. Iceland and occurred 

 gregariously at Vestmannaeyjar in May. 



SW. I c el. Einarslön. 



S. I cel. Eyrarbakki, Vestmannaeyjar. 



Ectocarpus Hinksiæ Harv. Manual p. 59, Phyc. Brit. tab. 22 ; Sauvageau, 

 Observations relatives à la sexualité des Phéosporées (Journal de Botanique 

 1896). 



This species has only been found in S. Iceland, and occurred abundantly 

 in May, often in company with the last named species, on Rhodymenia pal- 

 mata and Laminaria hyperborea in the sublitoral region. All the Icelandic 

 specimens resemble fully the typical form. Gathered with unilocular and 

 plurilocular sporangia in May. 



S.I cel. Vestmannaeyjar. 



Fam. Elachistaceæ. 



Leptoneina fasciculatuin Rke. Algenflora der westlichen Ostsee p. 50. 



var. subcylindrica K. Rosenv. Grl. Havalg. p. 879. 



The Icelandic specimens are fully agreeing with Rosenvinge's de- 

 scription. The sterile filaments are 7 — 12 p thick and the fructiferous 

 filaments have a thickness of 7 — 16^. It has been gathered with pluri- 

 locular sporangia in May, July and Sept., with unilocular sporangia in May. 

 It grows at low-water mark and sublitorally down to a depth of 4 fathoms 

 on other algæ e. g. species of Laminaria, Saccorhiza dermatodea and 

 Alaria esculenta. 



NW. I cel. Prestsbakki; Isafjöröur (CO.); Bi'ldudalur. 

 SW. Ice 1. Einarslön. 



Elachista fucicola (Veil.) Aresch., emend. Rosenv. Grl. Havalg. p. 878 ; 

 E. fucicola Strömf. Algveg. p. 49. 



