KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND. 20. N:0 5. 229 



muciferaj in the lamina, which are wanting in L. Agardhii. It can hardly be confounded 

 with L. saccharina, being quite different in appearance. 



It is impossible at present to disentangle its synonymy. But I believe that that L. 

 saccharina and L. caperata which is reported from Baffin Bay may be supposed to belong 

 to the present species and not to L. saccharina as it must be now restricted. On the 

 contrary, the L. cuneifolia reported from the White Sea appears to be referable rather 

 to L. Agardhii than to the species named L. cuneifolia by J. G. Agardh ^), and the 

 L. saccharina recorded from the American Arctic Sea may apparently be regarded as 

 L. longicruris. 



Habitat. The preseat species grew on the north coast of Siberia in exposed lo- 

 calities within the sublitoral zone in 2 — 5 fathoms water on stony and gravelly bottom. 

 It was gregarious here. All specimens taken from the end of April to the beginning 

 of July were in course of changing their lamina. The development of the new lamina 

 appears to commence at the beginning of April. On the remaining part of the old 

 lamina in some individuals collected at the end of April there was found a sorus with 

 sporangia containing zoospores. Specimens from Greenland probably collected in August 

 are richly provided with zoosporangia. 



Geogr. Distrib. In the Arctic Sea this alga is known from Baffin Bay and the 

 eastern part of the Siberian Sea. Gobi states it to occur also in the White Sea. Its 

 most northern known locality is Jakobshavn on the west coast of Greenland Lat. N. 69° 15'. 



Localities: The White Sea(?). Cp. Gobi, Algenfl. Weiss. Meer and above. 



The Siberian Sea: Irkaypi, Koljutshin Isle, Pitlekay, and the coast eastward of 

 this point, common and abundant. 



Baffin Bay: Cumberland Sound (?), the west coast of Greenland at Jakobshavn. 

 If the alga named L. saccharina by Croall, Dickie, and Ashmead should belong to 

 the present species, it is probably common and plentiful along the whole western coast 

 of Greenland up into Smith Sound. 



Laminaria saccharina (L.) Lamoue. 



Ess. p. -42. Fucus saccharinus L. Spec. Plant, 2, p. 1161. 



f. linearis J. G. Ag. 

 Lam. p. 12. 

 Descr. Laminaria saccharina a linearis J. G. Ag. 1. c. 



» » f. prima J. G. Ag. Spec. Alg. 1, p. 132. 



f. oblonga J. G. Ag. 



Lam. p. 12. 

 Descr. Laminaria saccharina b oblonga J. G. Ag. 1. c. 



') Gobi has kindly sent me for examination a fragmentary specimen of that plant from the White Sea which 

 he has called L. cuneifolia. This appears to me referable to L. Agardhii, although it is extremely difficult 

 to decide the question definitely. However, I have tried in vain to find any lacunae in the lamina. 



