A Monograph of the Genus Alaria. Ill 



GuNN. It is to be remarked here that in Tange des ochotischeu 

 Meeres, p. 364, Ruprecht says : " Alaria esculenta pinnatifida Illustr. 

 Alg. p. 11 vielleicht mit Ausschluss des synonyme von Gunnëe, 

 ist'die fiederförmig eingeschnittene Form, die wohl bei dem breit 

 —als auch schmalblättrigen PK alaüm und den übrigen unsicheren 

 Arten vorkommen kann." 



The plaut undergoes various modifications in the shape of the 

 frond according to its environment. In some cases, when it grows 

 in an open sea with comparatively rough water and fuU sunlight, 

 the blade becomes longer and the sporophylls generally approxi- 

 mate, narrower and longer, as to agree with f. fascicidata Stbömf. 

 On the other hand, the plant has some tendency to approach A. 

 erassifolia Kjellm., especially when the sporophylls are entirely 

 soriferous and much thickened. The present writer holds the view 

 that these two species are very closely related to one another, the 

 former inhabiting the Atlantic and the latter the Pacific, acquiring 

 more or less distinct local characters. 



Some authors regarded the general shape of a cross section 

 of the midrib as important enough for specific distinction. Rup- 

 EECHT, Strömfelt, Günner, etc, have mentioned various species 

 based on this character, while otherwise they may be taken as 

 mere forms within the specific limitation of A. escidcnta Geev. 

 BÖRGESEN also applied the character in separating A. esculenta and 

 A. Pylaii He, however, notes that the young specimens of A. 

 esculenta often have midribs which must properly be called two- 

 edged. As this question is not yet fully settled, I do not at 

 present attempt to amalgamate the two imperfectly known species, 

 A. linearis Ströme, and A. flagellqris Ströme., with the present 



species. 



However the frond may vary in the shape, the mode of 



