KONGL. SV. VET AKADEMIENS HANDLINGAE. BAND. 20. N:() 5. 239 



with zoosporangia 9 and 16 January (richly), 2, 8, 14 February and 5 March. Having 

 called this alga by the name of L. digitata in ray notes, I am not sure as to what 

 species the plant which was then fnrnished with zoospores did really belong, but I 

 suppose it was L. nigripes of which I possess in my collections several specimens taken 

 in Musselbay, all of them appertaining to f. ohlonga. It is thus possible that the deve- 

 lopment of zoospores takes place at difierent seasons in the difFerent forms on the coast 

 of Spitzbergen, during spring and the earlier part of summer in f. reniformis, during 

 autuinn and winter in f. oblonga. From the north coast of Tshutsh-land I have one 

 speoimen of f. reniformis taken in May, which is richly provided with zoosporangia, and 

 from the west coast of Novaya Zeralya one speoimen of f. oblonga taken in July Avith 

 mature zoosporangia. 



Geogr. Distrib. This species is probably circiirapolar within the Arctic Sea propei\ 

 I have found it most abundant and luxuriant on the north coast of Spitzbergen. The 

 most northern point where it has been taken is Treurenberg Bay on the north coast 

 of Spitzbergen Lat. N. 79° 56'. 



Localities: The Greenland Sea: the west and north coasts of Spitzbergen in Smee- 

 renberg Bay, Fairhaven, Musselbay, and Treurenberg Bay (f. reniformis and f. oblonga). 



The Murman Sea : the west coast of Novaya Zemlya at Karmakulbay (f. reni- 

 formis). 



The Kära Sea: Uddebay (f. reniformis). 



The Siberian Sea: the north coast of Tshutshland — some miles east of the win- 

 tering-station of the Vega (f. reniformis). 



Baffm Bay: the west coast of Greenland according to J. G. Ag. Grönl. Lam. och 

 Fuc. p. 18 sub L. atrofulva. 



Larainaria Clustoni Edm. 



Fl. Slietl. p. 54, sec. Le ,Tol. Exnm p. ,577. 



f. typica FosLiE. 



Laminaria digitata f. typica Foslie, Digitatn-Lam. p. 15. 

 Descr. Lamiuarin Clustoni Le .Tol. 1. c. 

 Fig. Larainaria digitata Harv. Piiyc- Brit. t. 22.3. 



f. longifolia Foslie. 



1. c. p. 19. 

 Descr. Laminaria digitata f. longifolia Foslie. 1. c. 



Syn. Fucus digitatus Wg. Fl. Lapp. p. 492; ex parte. 



» liyperborens Gunn, Fl. Norv. 1, p. .34, t. 3; saltera ex parte sec. Foslie, 1. c. p. 11. 

 Laminaria digitata Foslie, I. c. p. 14. 



Habitat. I have never myself met with this species in the Polar Sea. According 

 to Foslie who has devoted himself to the elucidating of the Scandinavian Laminarice 

 of the digitata group, it grows exceptionally within the litoral zone, usually gregarious 

 within the sublitoral zone at places exposed to the sea or in such more sheltered 



