KONGL. SV. VET. AKADEMIENS HANDLINGAH. BAND. 20. N:0 5. 217 



Alaria grandifolia J. G. Ag. 

 Gronl. Lam. och Fuc. p. 26. 

 Descr. Alaria grandifolia J. G. Ag. 1. c. 



» » Kjellm. Spetsb. Thall. 2, p. 10. 



Si/n. Alaria esculenta Eaton, List, p. 44 (?). 



» » Kleen, Nordl. Alg. p. 32(?); fide syn. 



» grandifolia Kjellm. 1. c. et Algenv. Murtii. Meer. p. .35. 

 Laminaria esculenta Lindbl. Bot. Not. p. 157 (?); Cfr. J. G. Ag. Spetsb. Alg. Till. p. 30. 



Habitat. This species is sublitoral, living generally at a depth of 2 — 15 fathoms. 

 It is met with in the interior of deep bays as well as on exposed coasts, in the latter 

 case sometimes near the shore, sometimes, when the bottom is favourable, several miles 

 off. It is on rocky bottom that it attains its greatest size. Living sometimes alone in 

 rather great numbers, sometimes in company with other Laminariacece, it constitutes an 

 essential element of the formation of Laminariacea3 on the coasts of Spitzbergen and the 

 west coast of Novaya Zemlya. I often met with young, sometimes very young, individuals 

 during the winter on the north coast of Spitzbergen. Only once or twice, in December 

 and January, I succeeded in finding some older specimens. These then bore zoosporangia 

 fully developed. Besides, I have collected specimens provided with zoosporangia at 

 Spitzbergen in July, August, and September, on the west coast of Novaya Zemlya 

 in July. 



Geogr. Distrib. This species has its maximum of frequency on the coasts of Spitz- 

 bergen. It is found with certainty also in the eastern part of the Murman Sea. But 

 the statement that it occurs on the north-west coast of Norway seems to me doubtful. 

 It is possibly a large A. membranacea that has been identified by Kleen with J. G. 

 Agardh's a. grandifolia. The northernmost known locality of the species is Treuren- 

 berg Bay on the north coast of Spitzbergen, Lat. N. 79° .56'. 



Localities: The Norwegian Polar Sea: Nordlanden (?). 



The Greenland Sea: the north and west coasts of Spitzbergen, common and plentiful. 



The Murman Sea: the west coast of Novaya Zemlya, local and probably rather scarce. 



Alaria dolichorhachis nob. 



A. stipite brevi, vix ultra pollicari saepe breviore, terete; rliachide elongata, in planta senili fere pedali, 

 apicera versus incrassata, supra sporophylla denuo contracta, in costara abrupte abeunte, compressa, in sectione 

 transversali elliptica, usque ad basira cicatricibus sporophyllorum abjootorum elevatis, superne in marginera muri- 

 culatum confluentibus insigni; costa prominula, in sectione transversali elliptica; lamina angusta, lanceolato-lineari, 

 in costam breviter decurrente, rigidiuscula, undulato-plicata; sporopliyllis primariis distantibus, ceteris approxi- 

 matis, in planta adulta numerosis, fasciculatis, elongatis, pluripollicaribus, angnstis, lineari-spatliulatis, vulgo 

 crispis, undulatis vel spiraliter contortis; soro sporophyllorum apicera longe marginemque angusta sterilem relin- 

 quente. Tab. 20, 21 et 25, fig. 11—18. 



Syn. Alaria esculenta Harv. F1. West. Esk. p. 49 (?). 



Description. The rhizines issue pretty regularly and in older individuals form two 

 sometimes three, alternating whorls. Their length depends on the solidity of the 

 substratum, the rhizines being shorter as the substratum is more solid. 



K Vet. Akad. Handl. Band. 20. N:o 0. 



28 



