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



miicifcnu iu the lainiua, wliicli are wanting in L. Agardkii. It caii hardly be coufounded 

 with L. saccharina, beint:: quite different in appearance. 



It is impossible at present to disentangle its synonymy. But I believe tliat 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 bo 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. Agardii ^), and the 

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

 L. longicruris. 



Hahitat. The present species grew on the north coast of Siberia in exposed lo- 

 calities within the sublitoral zone in 2 — 5 fathouis 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 lauiina 

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

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

 sporangia eontaining zoospores. Specimens from Greenland probably collected in August 

 are richly provided witli 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. Mecr 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 Ckoall, 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.) Lamouu. 



Ess. p. 42. Fucus sacoliaiiinis L. Spec. Plant, 2, p. 1161. 



f. linearis J. G. A g. 

 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 h oblonga J. G. Ag. 1. c. 



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

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

 to deoide the question definitely. However, I have tried in vain to lind any lacunse in tlie lamina. 



