KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 2359 
with zoosporangia 9 and 16 January (richly), 2, 8, 14 February and 5 March. Having 
called this alga by the name of ZL. digitata in my notes, | am not sure as to what 
species the plant which was then furnished with zoospores did really belong, but | 
suppose it was L. nigripes of which I possess in my collections several specimens taken 
in Musselbay, all of them appertaining to f. oblonga. It is thus possible that the deve- 
lopment of zoospores takes place at different seasons in the different forms on the coast 
of Spitzbergen, during spring and the earlier part of summer in f. reniformis, during 
autumn and winter in f. oblonga. From the north coast of Tshutsh-land I have one 
specimen of f. reniformis taken in May, which is richly provided with zoosporangia, and 
from the west coast of Novaya Zemlya one specimen of f. oblonga taken in July with 
mature zoosporangia. 
Geogr. Distrib. This species is probably circumpolar within the Arctic Sea proper. 
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 Kara 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). 
Baffin Bay: the west coast of Greenland according to J. G. AG. Gronl. Lam. och 
Fue. p. 18 sub L. atrofulva. 
Laminaria Clustoni Epm. 
F). Shetl. p. 54, sec. Le Jot. Exam p. 577. 
f. typica Fosuip. 
Laminaria digitata f. typica Fostip, Digitata-Lam. p. 15 
Deser. Laminaria Clustoni Le Jox. |. e. 
Fig. Laminaria digitata Hary. Phyc. Brit. t. 223. 
f. longifolia Fosum. 
te. p. £9: 
Deser. Laminaria digitata ft. longifolia Fosure. |. c. 
Syn. Fueus digitatus We. Fl. Lapp. p. 492; ex parte. 
» hyperboreus Gunn. Fl. Norv. 1, p. 34, t. 3; saltem cx parte sec. Fosire, |. c. p. 11. 
Laminaria digitata Fosnin, |. c. p. 14. 
Habitat. I have never myself met with this species in the Polar Sea. According 
to Fostre who has devoted himself to the elucidating of the Scandinavian Laminaria 
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 
