s«pf.,m4.i YENDO.-yOTES ON ALG.^ NEW TO JAPAN. IT. 271 



To the long-stiped form of f. palmata belongs also what Miya- 

 BE^^ has treated as L. Raprechtii De Toni. 



The other form, f. bifarcata P. et R., agrees with an older 

 stage of Hedophyllum spirale Yendo just before the scrolling of 

 the blades takes place ou both arms. The difference between the 

 latter species and Hed. subsessile lies essentially on the spiral 

 scrolling of the blades, as Setchell has already remarked"'. 

 But comparing numerous specimens in the European herbaria 

 I hesitate no more to amalgamate my species with Setchell's. 



As I was not able to find out the authentic specimen of f. 

 elliptica Kjellm. in any herbarium I have visited, I can not 

 enter into discussion about this forma. 



The present species is extremely variable in its morpho- 

 logical characters according to the age and the habitat. Those 

 growing between the tidal marks have always short stipes, often 

 not attaining to 1 cm in length, while those in the deeper 

 water have longer stipes. Kjellman also remarks that f. sub- 

 sessilis occurs in the litoral region and f. biiurcata in lower 

 part of the litoral region and upper part of the sublitoral.^^' 



When the plant is yet young, the stipe is simple and the 

 blade, flat and undivided. In the advanced stages, the blade 

 becomes broader and bullated, approaching, if not referrable to 

 at least a part of, L. bullata Kjellm. Then it splits into 

 several segments, begin the scroUings of both margins of the 

 transition region, at the same time, the meridional region of 

 blade beginning to decay. The result is bifurcated stipe with 

 one scrolled blade on each arm. New rhizoids may often ap- 

 pear later on the arms just below the blades. These stages of 

 development mav be satisfactorily traced by referring to the 

 following illustrations in order :- 1) IHustr. Alg. PI. XXXVIII, 

 fig. d, under L. crassifolia: 2) Illustr. Alg. PI. XIII, under L. 

 Bongardiana f. palmata. 3) Figure accompanied. 4) lilust. 

 Alg. PI. XIV, under L. Bongardiana f. bifurcata. 5) Bot. Mag. 



1) Eeport of Fisheries of Hokkaido, Laminaria Industry. 



