41 



under side of beetling rocks and on the shell of a crab in a 

 depth of 4 — 5 fathoms. 



Gathered in June and July. 



Gr. occ: Christianshaab (N. H.), Ivigtut (L. K. R.). 



Geogr. distribution: Iceland, Scotland, Ireland, Britain, Kattegat, 

 Helgoland, Normandy, Bretagne. 



80. S. britannica Sauvag. Sphacelaria p. 66; S. olivacea K. 

 Rosenv. Grl. Havalg. p. 904 ex parte. 



The Greenlandic specimens are perfectly typical and fully 

 agreeing with Sa^uvageau's description (I.e.). Both the speci- 

 mens from West Greenland and those from East Greenland were 

 gathered in July, and are sterile. The plants from West Green- 

 land grew in the littoral region in rock-clefts ; the specimens 

 from East Greenland were found on stones together with Litho- 

 derma. 



Sauvageau (I.e. p. 69) who founds his opinion on the 

 informations given by Rosen vinge (I. с.) as well as on the 

 examination of Giesecke's specimens in Thuret's herbarium, 

 declares S. olivacea from Greenland to be identical with S. hri- 

 ta?mica. It has however been proved by an examination of the 

 Greenlandic material that the specimens referred by Rosen- 

 vinge to S. olivacea really do belong to two species: S. radioavis 

 Harv. and S. britannica Sauv. 



The specimens of Lyngbye's herbarium mentioned by 

 Ros en vinge (I.e.) were gathered in Greenland by Giesecke 

 but are without any statement as to their habitats; they mostly 

 belong to S. britannica , but filaments of S. radicans are 

 however frequently found mingled with S. britannica. 



Gr. occ: Sukkertoppen (L. К. R.). 



Gr. or. : Кар Dalton. 



Geogr. distribution: Iceland, The Færoes, Scotland. 



