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On fiirthei- investigation, I think, it will turn out to be much more 

 common, at all events in NW. Icel. and N. Icel. 



E. Icel. BerufjorOur. 



N. Icel. EyjafjurOur. 



NW. Icel. isafjiJrOur (CO.!). 



SW. Icel. and S. Icel. common. 



Alaria Pylaii (Bory) J. Ag., emend. Rosenv. Gil. Havalg. p. 838. Alaria 

 Pylaii and Alaria membranifolia Stromf. Algveg. p. 39. 



From Alaria esculenta it is mainly marked by the two-edged shape of 

 the midrib, and the usually broader sporophylla. 



1'. typica Rosenv. 1. c. 



The length of the stipe is varying from 10— 66 cm., without regard 

 to young specimens. Specimens in their first year, which 1 met with, had 

 1,5 — 3 cm. long stipe, the sporophyll-bearing part of which was 1 — 1,5 cm. 

 The stipe is not rarely broadest in the middle. The sporophylls are 

 sometimes densely placed, but I have not rarely met with plants with few 

 and broad more or less distant sporophylls. They are 10 — 40 cm. long 

 and 3 — 11 cm. broad. Their shape is often obovate or spatulate. The 

 lamina is 30—100 cm. long and 14 — 34 cm. broad. The base of the 

 lamina is usually cordate, but narrower specimens have roimded or broad 

 wedge-shaped base. The broadest specimens I have met with in quiet 

 water in the inner end of fjords. 



f. memhranacea (J. Ag.) Rosenv. 



The specimens 1 have referred to tliis form have longer and com- 

 paratively narrower lamina than the typical form. The base is usually 

 broadly cuneate and often somewhat decurrent. A specimen with double 

 margin, a f. bimarginata, has been collected by Ostenfeld. 



The species is exceedingly common along the Icelandic coasts, and 

 seems to prefer somewhat sheltered places, especially the typical form. 

 It is found in the Laminaria-zone down to a depth of 15 fathoms, but 

 small specimens also occur in pools in the lower litoral zone. 



Alaria esvuienta (L.) Grev., Kjellni. Arct. Alg. p. 212, Handbok p. 19; 

 A. esculenta, A. linearis and A. flagellaris Stromf. Algveg. p. 38 — 41; 

 A. flagellaris Rosenv. Deux. Mem. p. 49. 



Without regard to young specimens ^) the length of the stipe is varying 

 from 10—120 cm. As the length and thickness of the stipe are varying 

 according to age, it is evident that they cannot be used as discerning 



^) Specimens at an age of two years, which I met with at Reykjavik, had a 

 stipe 6.5 cm. long, the blade-bearing part of which was 4,5 cm. long. 



