155 



Codiuin divaricatum Holm. 



Mom. Jap, ! Knrc-mirn. 



PL. CXXXVI. 



Codium divaricatum Holm. New Mar. Alg. from Japan p. 250, 

 PI. VII, f. 2 a, b (not C. divaricatum Gepp Cod. of the Siboga Ex- 

 pedition p. 136, 145, f. 195-199 and not C. dhar. Okam. Niphon- 

 sorui-meii, B ^lH & 3E, p. 189). C. subtubulosum Okam. sp. nov. 

 mscr., Niphon-sorui-meii, Fl^^Sf^K, P- 180. 



. frond is regularly dichotomous, usually 29-30 cm. high, 

 often attaining a height of So-ioo cm. in a well developed plant. 

 Branches are more or less compressed often subcylindrical in upper 

 segments as well as in stipital portion, patent, with round axils 

 and are broadly expanded beneath forks into flat and cuneate 

 segments where the breadth often measures 6-13 cm. The dis- 

 tances between forks are usually longer in the median portion of 

 frond, gradually becoming shorter above and below often attaining 

 30 cm. or more in a well grown frond. Apical segments are 

 divaricated or simply elongated gradually tapering upward into 

 blunt apices. In some specimens very irregular ramifications are 

 met with. Ulriatli are as a rule cylindrical, in some slightly clavate 

 or obovate, and generally somewhat truncated at apex with thin 

 apical wall when young, but afterward becoming much thickened. 

 They are 658-846 /* long and 6-S times as long as broad. Gamct- 

 angia are grown upon utriculi at about their middle portions or 

 rather below, but not without those arising higher and measure 450 

 ," by i So it. Colour dark saturated green. Substance thick and 



PL. CXXXV CXL. May 1915. 



