KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND. 20. N;0 5. 237 



f. reniformis nob. 



f. lamina reniformi, in laciuias numerosas usque ad basim digitato-fissa; lacunis muciferis stipitis nume- 

 rosissimis in orbem rtjgularem infra stratum corticale dispositis. 



ce. longipes nob. 

 f. stipite longiore usque 1 — 2 pedali, infra apicem complaiiato; laciniis laminse nuraerosis, sat latis. 

 Forma a J. G. Agardhio desoripta. 



[i. brevipes nob. 



f. stipite brevi, 2 — 6 pollicari; laciniis numerosissimis, augustis. 



f. oblonga nob. 



f. laraina late oblonga, basi soepe obliqua, integra vel in laciuias latas, pauciores plus minus profuude fissa. 



cc. comjjressa nob. 

 f. stipite longiore usque tripedali, superne eompresso, ssepe iufra apicem valde complanato; lacunis mu- 

 ciferis stipitis irregulariter infra stratum corticale dispositis, paucioribus, magnis. 



/?. subteres nob. 



f. stipite breviore, subterete; lacunis stipitis rainoribus, uumerosis iufra stratum corticale in orbem fere 

 regularem dispositis. 



Sjjii. Larainaria digitala f. latifolia Kjellm. Spetsb. Thall. 2, p. 26. 

 » » forma Kjellm. 1. c. p. 26 — 27. 



» )) f. typica (vera) Kjellm. Algenv. Murm. Meer. p. 38 et Kariska hafvets algv 



p. 25; ex parte '). 

 » » Kjellm. Vinteralgv. p. 64; ex parte. 



Remark on the species. In the collections of arctic alga3 that I have had tlie 

 opportunity of exaiuining, there is to be found a Larainaria of the digitata group taken 

 in different parts of the Arctic Sea, which I have forinerly confounded witb L. Jiexicaulis 

 Le Jol. and recorded under the natne of L. digitata. J. G. ågaedh bas separated it 

 from L. digitata and described it as L. nigripes. By a niore anatomical investigation 

 of a greater nuiuber of Laminarice from different regions I have arrived lately at 

 the conclusion that the structure of the lamina and the presence or absence of muci- 

 ferous lacunaä in the various parts of the frond ought to be accounted more important 

 in distinguishing the species of this group of algaa, than I supposed formerly, relying 

 on the authority of J. G. Agardh. Consequently I must acknowledge L. nigripes 

 as a well differentiated species. It resembles closely L. digitata (L. flexicaidis Le 

 Jol.) in habit and possesses a series of forms similar with this, but in structure it 

 accords more nearly with L. Clustoni Le Jol. As in this species, there are muci- 

 ferous lacunaj in the stipe, the middle layer of the lamina is very dense, sharply de- 

 fined from the intermediate layer and the latter layer composed of large cells with 

 thin walls. By these marks it is plainly distinguished from L. digitata {L. flexicaidi!< 

 Le Jol.). On the other side it differs decidedly from L. Clustoni by no cork layer 



') J. G. Agardh supposes tbat tbe Laminaria from the west coast of Greenland mentioued by Brown in Fl. 

 Disc. under the name of L. digitata is to be referred to the present species or to L. atrofulva. Cp. J. G. 

 Ag. Grönl. Lam. och Fuc. p. 18. 



