

Ceratodictyon spongiosum Zanard. 



Norn. Jap. : Kaimen-so. 

 PL LI-LII, 



Ceratodictyon spongiosum Zanard. Phyceac Papitanac n. 8 ; Eng- 

 ler-Prantl Nat. Pflanzenfam. I, 2. p. 388 ; De Toni Syll. Alg. IV, p. 

 409. Sporgia cartilaginca Espcr fider Semper Nat. Exist, d. 

 Thicre II, p. 777- /<?/. Marckesettia spongioides Hauck ; Asken. 

 Alg. Forschungsr. Gazelle p. 40, t. XII, f. i-n. 



Hab. : Widely stretched on rocks between tide-marks. Provs. 

 Kagoshima, Hiuga, Tosa, Kii (C. Shiwo-no-misaki). Plants are 

 variegated with dark bluish purple and greenish colour. 



PL. LI. Fig. 1-2 : fronds of Ceratodictyon spongiosum Zanard. 

 bearing antheridial ramuli, in nat. state and size. Fig. 3 : portion 

 of frond in nat. size, showing the surface of frond, fertile ramuli, and 

 osculi. Fig. 4- : portion of the cross-section of frond showing the 

 sponge and net-work-like structure of frond, 4 . Fig. 5 : sarcode, s, 

 of the sponge and spicules, ^f 5 . 



PL. LII. Fig 1 : growing apex of the frond, - j. Fig. 2 : cross- 

 section of a ramulus, -f. Fig. 3: portion of the cross-section of a 

 ramulus, - 3 ^ Q . Fig. 4 : portion of the longitudinal section of a 

 ramulus, ^- Q . Fig. 5 : terminal portion of a sterile ramulus standing 

 free from the net-work, ^. Fig. 6 : upper portion of frond bearing 

 antheridial ramuli, J ^. Fig. 7 : portion of the longitudinal section of 

 a ramulus bearing an antheridial patch, - 2 -p. Fig. 8 : longitudinal 



PL. LI-LV, May, 1909. 



