﻿PLATE XXI. 

 Gelid ium japonicum (Harv.) Okam. 



GELIDIACE 疋， 



Nom. Jap. : Oni-hisa. 



Sithria japonic a Harv. Al び. Wngnt., no. 26 ； De Toni Phyc. Jap. 

 Nov. (1895), p. 22， no. 21 ； Id. Syll. Alg. Vol. IV, p. 164; J. Ag. 

 Epicr. p. 554 (Nomen) ； Okam. Alg. Jap. Exsic. no. 6. — Porphyroglosswn 

 japonicum (Harv.) Schm. Neue jap. Florid., (1894), p. 7. 



Root fibrous, branching. Fronds single or csespitose, ancipito- 

 compressed, linear, mid ribbed, branching or dividing from sides 

 and proliferate from both margins and surfaces, 4-20 cm. high, 

 1.5-2 mm. broad. Branches are sometimes more or less regularly 

 alternate, sometimes much more irregularly ； and by the growth 

 of proliferations into branches, ramification becomes more and 

 more irregular. Proliferations, which are narrowed at bases, arise 

 from the midrib, both marpins, and intramarginal portions of both 

 surfaces as well as from ends of branches. At the beginning, 

 proliferate ramuli are very minute and ciliary ； soon they grow 

 up into narrow spatulate or oblong ramuli which usually become 

 2-3 times pinnately compound, rarely remaining* simple or folia- 

 ceous, especially in tetrasporic frond. Branches are rarely free 

 from marginal proliferations, while their surfaces are often void 

 of them. In a robust form, proliferations are so much dense that 

 the rachis is invisiole through them and the latter seems as if 

 densely loaded with short and echinate ramuli. There is no 

 definite order for the disposition of branches which arise very 



PI. XXI-XXV, Oct" 1901. 



