30 



times not at all separated from the latter by a constriction. 

 J. Agardh calls this Ungulate apex ligula, and he considers it 

 a part of the young lamina. It is scarcely correct to explain 

 «the ligula» in this way, as no ligula at all is found in very 

 young specimens in their first year. I am of the opinion that 

 the ligula always is the remainder of an older lamina, and 

 the constriction occurs with age, as the breadth of the lamina 

 increases. 



Judging by what I have seen in young specimens from 

 Greenland it seems justifiable to suppose that the plant does 

 not produce any sorus for the first 2 (or 3) years of its life. 



The length of its stipe naturally varies according to the 

 age of the plant; the longest stipe was 80 cm. long. In order 

 to show the size of some of the specimens of which the lamina 

 dates from the fourth year (in a single case the lamina dates 

 from the second year), the following measures are given in 

 centimeters: 





Stipe 



The length and the breadth of the laminæ 



Total length 



a 



b 



с 



d 





length 



breadth 



length 



breadth 



length 



breadth 



length 



breadth 



219 



50 



44 



23 



46 



30 



49 



30 



30 





209 



34 



60 



29 



50 



25 



40 



24 



25 



15 



245 



60 



46 



20 



62 



25 



47 



20 



30 



15 



190 



80 



60 



23 



50 



21 











In this table a indicates the young lamina; b is one year, 

 с two, and d three years old. 



The specimens were collected in a depth of 3 — 10 fathoms 

 both on open shore and in sheltered locality in rapid current. 

 Smaller specimens were found at Ikerasak in a rich vegetation 

 of Laminaria sheltered by a sea cliff, where no drift ice would 

 normally appear. The species was collected in June and July, 

 with sortis in the young lamina in June. In many of the 



