- 175 — 



The sorus forms usually a continuous central band in the upper 

 part of the lamina and attains a breadth up to 20 cm. Sometimes I have 

 found the upper part of the sorus consisting of some irregularly shaped, 

 dispersed patches. Specimens having a rest of the old lamina attached 

 have been met with in May and July. Fructiferous specimens have been 

 gathered in May and August. This form has been found on sheltered coasts, 

 especially in sheltered places at the heads of the fjords, in a depth of 

 2 — 10 (and up to 20) fathoms. In DyrafjorOur it occurred gregariously. 



E. I eel. BerufjorOur, ReyOarfjorOur. 



NW. Icel. isafjorOur; OnundarfjorOur (Ldbk.); DyrafjorOur (G. 0. !j; 

 TalknafjorOur (Ldbk.). 



Laiiiinaria fjeroensis Borgs. Fser. Alg. p. 454, var. 



Laminarise with hollow stipe are extremely rare along the coasts of 

 Iceland. In a collection of Laminarioe from N. Iceland, brought together 

 by Mr. 0. Davi'Osson in February 1898, two specimens were found having 

 undivided lamina and hollow stipe, which was destitute of muciparous 

 canals. In May 1 898 Mr. R. Horring met with Laminariae with hollow stipe, 

 growing abundantly in the interior of BerufjorOur, but he gathered only 

 some fragments of the stipe. As I, later in the summer, came to Beru- 

 fjorOur, I found immediately, after Mr. Htirring's assignment, the growing- 

 place of this Laminaria, and there the most of the Icelandic material of 

 this species has been gathered. 



The Icelandic specimens resemble habitually a deep-water form of 

 Laminaria saccharina. The hapterae being long, thin and much divided 

 resemble fully the ha])terae of L. saccharina f. latifolia. The stipe is 60 

 — 140 cm. long, usually thickest (about 2 cm. in diameter) in the middle, 

 hollow and destitute of muciparous canals. In my specimens the largest 

 part of the stipe is hollow, and only the uppermost and the lowest part 

 are solid at a length of some few cm. The lamina is 130 — 300 cm. 

 long and 40 — 90 cm. broad. The broadest part is usually situated in 

 the middle of the lamina, but sometimes it is found below or above 

 the middle. The shape of the lamina is usually lanceolate or oblong, 

 sometimes oblong-elliptical. The marginal area of the lamina is broad, 

 more or less, sometimes strongly, waved and thinner than the smooth 

 or almost smooth middle area, in which shallow depressions sometimes 

 are to be found. The base of the lamina is broadly cuneate, rotundate 

 or usually cordate. The muciparous canals I have found scarcely occurring 

 in the lamina; they are rather great, and usually the most of the sur- 

 rounding cells are small. They resemble almost precisely the muciparous 

 canals of Laminaria saccharina f. grandifolia (Kjellm. Arct. Alg.. Tab. 25, 

 f. 7), but are situated nearer to the surface of the lamina. The trans- 



12* 



