213 



Halimeda iucrassata Lam. f. typica Barton. 



Norn. Jap. : Mitsude-sa&otengusa, 

 PL. CL. 



Halimeda incrassata Lam. f. typica Barton The Genus Halimeda 

 p. 27, fig. 39; Halimeda monilc, H. tridcns, H. cylindrica, H. poly- 

 daclylis are synonyms for several forms of Halimeda incrassata. 



Plants varying in length to about 16 cm., thickly calcified, 

 especially below, branching in one plane. Root bulbous or 

 cylindrial. Lower joints deeply calcified (thickest 8 mm. in dia- 

 meter), sometimes forming a cylindrical unbranched stem, adjacent 

 cylindrical joints connected by lime to form fan shaped base ; upper 

 joints cylindrical or more or less trilobed ; often 8 mm. long, 1-2 

 mm. broad. 



f. Lamourouxii Barton. PI. CXLIX, Fig. 9-10. 



H. incrassata var. Lamoiironxii }. Ag. Till Alg. Syst. VIII, 

 p. 86. 



Plants 5-6 cm. high ; lower joints broadly cuneate or lobed, 

 slightly ribbed or uneven ; upper joints more or less reniform, thin, 

 compressed, or more flattened, not deeply calcified, upper margin 

 lobed. Colour gray-green ; plants shining with somewhat silvery 

 lustre. 



Hab. : Ryukyu (Kuroiwa and Ando). 



PI. CXLIX, fig. 9-10. Fig. 9 : frond of Halimeda incrassata 

 Lam. f. Lamourouxii Barton, \. Fig. 10 : filaments of central 

 strand, shewing pits at point of fusion. ^. 



