21 



Fam. Laminariaceœ. 



Alaria Grev. 

 40. A. Pylaii (Bory) J. Ag., emend. К. Rosenv. Grl. Havalg. 

 p. 838, Deux. Mém. p. 48. 



a. typica K. Rosenv. Grl. Bavalg. 1. c. 

 Some small specimens perfectly typical with few and broad 

 sporophylls were gathered in September. 



ß. membranacea (J. Ag.) K. Rosenv. Grl. Havalg. 1. с 

 This variety is .more richly represented in the collection 

 than the former one. It is rather variable, and as mentioned 

 by Rosenvinge, plants agreeing in one respect with one and 

 in another respect with another variety are not uncommon ; 

 therefore any plain distinction between these varieties cannot 

 easily be made. On the other hand var. membranacea is more- 

 over so closely connected with Alaria grandifolia J. Ag. that 

 according to our present knowledge of these forms they cannot 

 be said to differ in anything, but their size. 



Var. m,embranacea was gathered with sporangia in July. 



y. grandifolia (J. Ag.) , Alaria grandifolia J. Ag. Grl. Lam. 

 p. 26. 



To this variety I have referred two specimens from East 

 Greenland. They remind of var. typica as to the breadth of 

 the lamina and the cordate base ; on the other hand as to the 

 length of the stipe, the form of the lamina, the form and the size 

 of the sporophylls, they resemble so much var. membranacea, 

 that no natural distinction can be made. As these particular 

 specimens fully agree with J. Agardh's description oï A. grandi- 

 folia (1. c.) I have referred them to this species, and as it seems 

 to me that a specific character is only artificially established 

 between this species and A. Pylaii, as enlarged by Rosen- 

 vinge, I at least provisionally regard A. grandifolia as a 

 variety of A. Fylaii. 



