- 180 — 



f. cucullata Le Jol. Exam. 



The specimens I have referred to tliis form are all rather large. The 

 stipe is :27 — 50 cm. long, the lamina 50— 70 cm. long and up to 70 cm. 

 broad. The stipe is terete below and somewhat compressed upwards, 

 usually it is thickest in the middle, but sometimes the thickest portion is 

 situated below or above. The lamina is sometimes undivided and cucul- 

 late, but usually it is split into two, equally broad segments; some speci- 

 mens having the upper part of the lamina split into some few and broad 

 segments make the transition to f. genuina. The base is usually cordate. 

 I have seen specimens fully agreeing with Foslie's figures: Tab. 7, f. 5, 

 Tab. S, f. 1 and Tab. 9, f. 2 (Fosl. Lam.). 



This form occurs in sheltered places in the interior of fjords In a depth 

 of 2—10 fathoms. It had ripe sporangia in the beginning of August. 



f. genuina is common elsewhere along the coast. 



f. stenophylla. Typical specimens have been found in : 



E. I eel. Borgarnes. 



SW. I eel. OndverQarnes. 



S. I eel. Eyrarbakki (Stromfelt !), Vestmannaeyjar. 



f. cucullata: 



E. I eel. BerufjorSur. 



NW. IsafjorOur (G. 0.). 



Laininarui hyperborea (Gunn.) Fosl. Lam. p. 42 ; Stromf. Algveg. p. 44 ; 

 Laminaria Gloustoni Le Jol. Exam. p. 577; Fig.. Fosl. Lam. Tab. 1. 



All the Icelandic specimens I have seen belong to the typical form. 

 In S. and SW. Iceland it occurs gregariously in the Larainaria-zone, down 

 to a depth of 1 5 fathoms, but it goes also farther down and is met with 

 in a depth of 20 fathoms. Small specimens occur in tide-pools in the 

 literal region. The largest specimen, I have measured, had a total length 

 of 5 m. The length of the lamina is somewhat varying, according to age, 

 I think. Thus I have met with large specimens the lamina of which was 

 twice as long as the stipe, but other specimens had the stipe twice as 

 long as the lamina. 



At Reykjavik it occurred in April almost everywhere having a rest of 

 the old lamina attached to the young one. Ghange of lamina has also 

 been observed in June, and even in July (on the North-coast). Fructiferous 

 specimens have been met with in May. 



On the stipe of this plant, many species, chiefly belonging to the Flori- 

 deae, are to be found, and sometimes I have found the stipes almost 

 totally covered by Dermatolithon macrocarpum or Lithophyllum Grouani, 

 sometimes it is densely covered with a matted growth of Polysiphonia 

 urceolata, Rhodochorton Rotliii, Antithamnion a, o. 



