— 174 — 



frequent along the coasts of Iceland. 1 have met with it at Vestmanna- 

 eyjar and Reykjavik, and Stromfelt has indicated it from Eyrarbakki and 

 Reykjavik. 



Small specimens gathered by 0. Davi'Osson in N. Iceland (Grimsey), 

 probably belonging to this form, were fructiferous. The sorus was of the 

 same appearance as in the main form and formed a continuous, central 

 band in the upper part of the lamina. In E. Iceland I have met with 

 specimens, the lamina of which was 160 cm. long and 15 cm. broad, 

 the stipe 80 cm. long. The lamina was thin, leathery and had a 120 cm. 

 long and 1—1,5 cm. broad continuous sorus in its centre. These spe- 

 cimens , I think , are to be regarded as transitory forms between the 

 f. linearis and the main form. 



Specimens having a rest of the old lamina attached, 1 met with at 

 Vestmannaeyjar in May. 



In pools in the litoral region I have not seldom met with speci- 

 mens of a young L. saccharina precisely agreeing with the f. phylUUs 

 (Laminaria phyllitis auct.) which possibly is to be regarded as a young 

 f. linearis. 



f. latifoUa Kjellm. Handbok p. 26, Laminaria saccharina f. latissima 

 Kjellm. Arct. Alg. p. 230; Stromf. Algveg. p. 43? 



This form is, as mentioned above, connected with the main form 

 with intermediate forms, and differs from it mainly in having more slender 

 stipe, thinner, proportionally broader, and more frangible lamina without 

 rugae and buUations. 



The stipe is 40-90 cm. long, terete below and somewhat com- 

 pressed upwards ; it frequently attains the greatest thickness in the middle. 

 The lamina is 40—140 cm. long and 30 — 60 cm. broad, of an ovate 

 shape, in young plants, or an oblong-ovate or elliptical shape, in older 

 plants. The broadest portion of the frond is usually situated below the 

 middle, sometimes it is in the middle, and very rarely it is found above 

 the middle. The base of the lamina is broadly cuneate, rounded or 

 cordate. The marginal area is usually wavy and thinner than the smooth 

 or almost smooth middle area. 



The most typical specimens of this form, 1 met with in DyrafjorOur 

 in a depth of 7 fathoms; they measured as follows: 



