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Contribution, T. 



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Laminaria Gunneri Fosl 



Lam. Norw. p. 54. 



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Descr, Laminaria Gunneri Fosl. 1. c. 



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t. 2, 



I have been nncertain wliether this species ouglit to be 

 kept distinct, or only to be regarded as a form of L. m^nj)C5. 

 I have latterly got a nnmber of other and better conserved 

 specimens than I had by the description of this plant. I 



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then qnoted the colonr to be very dark, almost black, and 

 the lamina inpellucid. This appears now chiefly to be founded 

 thereon, thatthe specimens probably have lain on the beach 

 for some time. The colonr really is only a little darker 

 than by L. nigripcs. 



After a careful examination of the. materials I have at 

 my disposal I find, however, that the plant in c[uestion mnst 

 be considereda distinct species. It is smaller than L. wi^npc^. 

 The length is varying between 30 and 60 cm. By 14 speci- 

 mens the stipe has a length of 7—22 cm., and the length of 



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the lamina by 26 specimens is 20~40 cm.* L. nigripes is 

 commonly mnch larger and a more vigorous plant. Of this 

 .plant I have coUected specimens, the lamina of wbich has a 

 length of 130 cm, (a part of the stipe is wanting), and its 

 consistency is less solid than by L. Gunneri. By a transverse 

 section of the middle part of the lamina of L. Gunneri^ the 

 cells of the intermediate layer are more eq^nal in size in the 

 greater part of the layer, angnlar or rounded-angular, not 

 seldom squarish, with thick walls and often ranged in more 



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or less regular longitudinal series. The named layer is more 

 or less sharply defined from the middle one, and the latter 

 is thicker in proportion to the intermediate layer than by 

 L. nigripes. By a simihar section of L, nigripes the cells of 

 the intermediate layer are more irregular with regard to the 

 form as well as the size, with thinner walls, and they are 



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12 specimens are wanting tlie lower part of the stipe. 



