jmy, wis.] K. YENDO:—NOIES OS ALGAE NEW TO JAPAN. VII. 199 



receptacle is found under S. glaucescens forma. The specimen 

 is collected by Kjeixman in Borneo (specimen No. 2353). It 

 has much diverged characters from the type of S. glaucescens 

 J. Ag. from Macao, and appears to be identical with this 

 species. A specimen (Xo. 2511) under S. ilicifolium in the same 

 Herbarium has also a close affinit\', if not identical, with this. 



The question whether the present species should be identified 

 with S. squarrosum Grev., as pointed out by Reinrolr, must 

 be kept for future study. I have not at all hesitation to deny 

 the combination of S. squarrosum Grev. and S. biserrula J. Ac 

 as done by J. Agardh. 



Locality. Amakusa, Higo Prov.(!); Koshikijimn, Satsuma 

 Prov.(!). 



Distribution. Dutch Indies. 



Sargassum gracillimum Rued. 



In Weber van Bosse : Liste des Algucs du Siboga, I, p. 172, 

 fig. 48-49. 



This species has a close similarity with S. hemiphyUum in 

 every character of frond, so that the two species mav be 

 hardly distinguished from each other by mere descriptions. In 

 general appearance of fronds, however, both differ greatly so 

 that we ma}- separate them at one glance. The characteristic 

 feature of the present species lies in the narrow linear leaves 

 in every part of frond. The leaves on the principal stem mav 

 be more or less hemiphylloid but never in such degree and 

 never so broad as found in S. hetniphylltltn. The leaves are 

 sparingly serrated in both species, especially those on the prin- 

 cipal stem, and even frequently entire. But the serratufe in this 

 species is remarkably sharper than in the other, giving rather 

 .-i spinulated appearance lo the leafmargins. The root is 

 equally fibrous in both. 



The present species mav 1).' well taken as one of I he 



variations 61 S'. hemiphyUum. Bui as li is always rea'dily 

 distinguished from the other forms, I choose to mention it as 



