- 176 - 



verse section of the frond seems also to resemble that of L. sacch. f. 

 grandifolia (Kjelhn. Arct. Alg. p. 231), as the parenchyma of the lamina 

 consists of large, thin-walled cells. 



Most of the specimens, I gathered August 2 nd , were fructiferous. The 

 sorus forms a central band in the upper part of the lamina and attains 

 a length of 40 cm. and a breadth of 4 — 10 cm. I have but rarely seen 

 the lower part of the sorus consisting of two rows or dispersed patches. 



Following measurements show the size of the lamina in proportion 

 to the stipe, and the breadth of the former in proportion to its length: 



Total 



Length 



Length 



Breadth 



length 



of stipe 



of lamina 



of lamina 



349 cm. 



136 cm. 



213 cm. 



51 cm. 



190 - 



60 - 



130 - 



50 - 



140 - 



70 - 



170 - 



40 - 



272 - 



98 - 



174 - 



45 -, 



? 



? 



297 - 



86 - 



313 - 



117 - 



196 - 



57 - 



All my specimens had distinctly hollow stipe, but judging from the occur- 

 rence of hollowness in Laminaria longicruris (Rosenv. Grl. Havalg. p. 846) 

 and in the Færoese specimens, I suspect that the stipe in an earlier stage 

 of age has been solid. They were growing gregariously in a sheltered 

 place, Fossårvik, in the interior of Berufjöröur, on stony bottom in a depth 

 of 8—15 fathoms, but nearer to the coast this species was replaced by 

 Laminaria saccharina. 



Of all the known species of Laminaria the Icelandic specimens come 

 nearest to Laminaria færoensis, from the typical form of which they only 

 differ by the comparatively longer lamina and consequently somewhat 

 different shape, but the same difference in shape of lamina is to be met 

 with in the forms of Laminaria saccharina. While the Icelandic specimens 

 in regard to shape most resemble the main form of L. saccharina, the 

 typical Færoese specimens may be regarded as analogous to the f. latifolia 

 of L. saccharina. 



Laminaria færoensis is most nearly related to Laminaria saccharina 

 and Laminaria longicruris, and is only separated from the former by the 

 presence of hollowness in the stipe and from the latter by the absence of 

 muciparous canals in the stipe. Of which value, as specifically distinctive 

 characters, the hollowness and the absence or presence of muciparous 

 canals in the stipe is, must at present be left undecided. We know at 

 present about the hollowness of the stipe that it occurs in species with 

 large, undivided lamina, long and comparatively weak stipe, growing in 

 sheltered situations, either in deep-water or in quiet shallow water. We 



