6o 



Grateloupia ramosissima Okam. n. sp. 



Nom. Jap. ! Sudzi-imikade. 



PL. CXVII, Fig. 1-11. 



Diagn. : Fronds caespitose, erect, loosely entangled, filiform, 

 subcylindrical below, soon compressed above, somewhat flexuose, ir- 

 regularly branched on all sides with a few dichotomous segments ; 

 branches elongated, patent, constricted at base and tapering to apex, 

 loaded with short ramuli. Fruits of both kinds collected in ramuli. 

 Cells are firmly coalesced and the substance is cartilaginous. 



Hab. : On rocks near high tide between tide marks. Ama- 

 mi-Oshima, Provs. Suruga, Sagami, Boshyu. Fruits : late spring 

 to summer. 



Descrip. : Fronds caespitose, rising from callous discs, form- 

 ing a roundish cluster of more or less loosely entangled filiform 

 branches, almost cylindrical at the base and compressed above, 

 15-20 cm. high, 1-1.2 mm. broad; irregularly branched on all sides 

 in pinnate manner with a few dichotomous segments, with branches 

 constricted at origin and tapering to a fine apex, widely patent, 

 almost horizontal, somewhat flexuose or curved more or less loaded 

 with lesser ramuli. Fronds consisting of three layers of cells ; the 

 medullary layer of loosely and longitudinally running filaments, 

 gradually becoming denser outward ; the subcortical layer of 

 roundish cells, which pass into dichotomous moniliform filaments of 

 the cortical layer. Cells are firmly coalesced and the dried frond 

 long resists the action of water in reimmersion. Tetraspores and 

 cystocarps densely collected in ultimate ramuli. Neucleus is rather 

 smaller than that of other related species and the filamentous 



