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Grateloupia cornea Okam. n. sp,, 



Nom. Jap. ! Tsttno-mukade. 

 PL. CXVIII. 



Diagn. : Fronds high, caespitose, linear, compressed, more or 

 less stipitate, many times dichotomous, patent, bifid or emarginate, 

 with simple or forked proliferous ramuli on both sides which are 

 constricted at the base. Cystocarps and tetraspores collected in 

 terminal segments and proliferous ramuli. Tetrasporic sori linear 

 or linear-oblong. Filamentous tissue surrounding the neucleus is 

 rather weakly developed. Substance is almost horny and the plant 

 long resists the action of water. 



Hab. : On rocks near high tide between tide marks. Provs. 

 Totomi, Sagami, Boshyu, Kadzusa, Hitachi and Rikuzen. Cysto- 

 carps and tetraspores : summer. 



Descrip. : Fronds caespitose, rising from callous discs, erect, 

 linear, compressed, 15-20 cm. high and 1-2 mm. broad, more or 

 less stem-like below, many times regularly dichotomous, often 

 flabellate in outline, patent, with lower dichotomies more distant 

 than the upper and ending in bifid or emarginate blunt apices, 

 with simple or forked proliferous ramuli, constricted at the base, 

 arising from both sides of branches and from harmed ends. Struct- 

 ure of the frond is that of the genus ; medullary filaments are 

 more or less loosely set, surrounded by larger and roundish sub- 

 cortical cells which are covered by dichotomous moniliform filaments 

 of the cortical layer. All the cells are firmly coalesced and the 

 plant long resists the action of water. Tetraspores and cystocarps 

 are collected in terminal segments or in proliferous ramuli. Tetra- 



