THE FUCACE-F, OF .TAI'AX. 71 



petiole of the fulcrant leaves, as in the case of Sargassum patens. 

 The leaflets, on the petioles of which the receptacles are borne, 

 are narrowly linear, almost filiform, tapering gradually upward. 

 They have no rib but have conspicuous cryptostomata along both 

 edges. 



Vesicles are always solitary at the base of the lateral branches, 

 and not seldom the lowermost division of a receptacular ramulet is 

 modified into a vesicle. They are ovate, apiculated while young, 

 crowned with a long simple or furcated leaflet when fully grown, 

 spotted with cryptostomata, and provided with a flattened stalk 

 sometimes twice as long as the vesicle. 



Receptacles are subcylindrical, granulöse, each with a short 

 cylindrical stem below. They are paniculately disposed on the 

 lateral branches. 



Relation to other species. The primary shoot and its manner 

 of development suggest the subgenus Schizophycus J. Ag.; and the 

 species evidently stands near the preceding species. The fertile 

 ramules of both the present sjiecies and Sargassum patens are very 

 much alike but the latter species has more rece^itacles to a ramulet; 

 while the former has, as far as I have been able to ascertain, less 

 than four of them. The two species, however, may be readily dis- 

 tinguished by their leaves. 



Locality. Tosa Prov. (!). 



Sarfffissnm knshiivajhnnmun Yexdo. 



Plate VII. Fig. 4. 



Diagnosis, Caule , ramis complanatis ramulos a margine pinnatim 



emittentibus ; ramulis teretibus pinnatis; foliis fulcrantibus brevissime 

 stipitatis, palmatim pinnato-dichotoniis, laciniis linearibus, subdentatis, 

 costatis; vesiculis maximis, in petiolo ipsas œquale, sphîericus, foliis 

 piunatis vel siraplieibus coronatis; receptaculis , . 



