110 Vol. XLm., Art. 1— K. Yendo : 



the stipe, a few lowermost ones at wide intervals, but middle and 

 upper ones approximate and regularly disposed, adding new ones 

 successively upwards, narrow caneate, 5-15 cm. in length, tapering 

 gently into cylindrical petioles towards the attachment point to 

 the stipe ; tip round or obtuse. Sorus in a continuous patch with 

 sharp boundary on both surfaces of each sporophyll, occupying 

 lower half area of the surface except a narrow border along the 

 margin. 



Remarks on the limit of variation. In Illustr. Alg., Postels 

 and RuPKECHT distinguished various formoe under the present species, 

 viz., angustifolia, latifolia and pinmdificla. As will be stated below, 

 the specific conception taken by these authors is much wider than 

 as we now define the species. The three forma\ therefore, must 

 be separated from the present heading. What are meant by these 

 formas will bo treated later on. 



Faelow mentions a variety of the present species, var. latifolia, 

 in Marine Algae of New England, p. 97. It has been referred to 

 A. Pylaii Grev. by Setchell. Cfr. Phyc. Bor.-Amer., No. XCIV. 



Kjellman distinguished two formae, f. australis and f. musce- 

 folia, and referred to some old descriptions under each name. 

 But the specimens collected by Foslie at Lödingen and determined 

 by Kjellman as f. musœfolia, now kept in the Agardhian Her- 

 barium, do ]iot agree with the authentic specimens of Laminaria 

 musœfolia De la Pyl in important points and are nothing but a 

 typical form of A. esculenta Grev. 



Strömfelt distinguished a form with densely aggregated sporo- 

 phylls under f. fasciculata. Börgesen^) remarks that this form 

 <3omes quite near to what he called A. escilenta f. typica. He 

 mentioned another forma, f. pinnata and refers to Fucus pinnat'js 



1) BüBGESEX : Mar. AJg. Fieröes, p. 449. 



