― 233 ― 



Geliaium subcostatum Okam. 



Norn. Jao. : hira-hisa, 



PL XLVI. 



Gclidium siibcostatuui Okam. in Schmitz's Neue japanische 

 Floridcen von K. Okamura (liedwip-ia Bd. XXXIII, 1S94) p. i. Taf. 

 X); 岡 村， [J 本 藻 額名覺 p. 21. 



Diapii. "ト roud compressed two-ecl^^ecl, clistichously pinnate ； 

 main branches distinctly midribbed with acute axils. Tetraspores 

 cruciate in ciliform simple or branched pinnae. Cystocarps oval, 

 immersed below the apex of pinnae, bilocular ノ， 一 Okam、 Lc. 



Plant of the present species often attains i metre or more 

 in height. 



Hab. - On rocks, stones etc. in deep waters ； Provs. Hiuga, 

 Shima, Idzu, Awa and Sai7ami. Fruits : ― late spring to summer. 



PL. 入 LVI. Fics 1 ： sterile frond of Gelidium siibcosiaiiun 

 Okam., \. ― Fi?". 2 : cross-section of frond, niao'd. 一 Fig. 3 ： portion 

 of the cross-section of frond, niao*d. — np". 4： ： portion of frond w^ith 

 etras poriferous ramuli, nat, size. — Fig. 5 : tetrasporiierous ramulus ； 

 s, sorus ； s\ the same emptied, — Fig. 6 : tetrasporiierous ramulus, 

 inagd. ― Ficr. 7 ： cross-section of a tetrasporiierous ramulus ； 3 spores 

 detached, mapd. ― Fig. 8 ： portion of branch bearing cystocarps, nat. 

 size. — Fig. 9 : cystocarps, き. 一 tip: 10 : cystocarp viewed from 

 surlace, f. — higr, 丄 丄 ： the same as fig. lo viewed laterally, さ. 一 Fip*. 

 12 : longitudinal section of the same cut throup^h carpostomes, mapxl. 

 —— Fig. 13 : cross-section of a cystocarp magd. 



PL. XLVI-L, Feb. 1909. 



