47 



Cystoseira articulata J. Ag. 



Mom. Jap.! Yabanc-inoku. 

 PL. CX1V. 



Cystoseira artiatlata }. Ag. Sp. Alg. I, p. 216. Hormophysa 

 articnlata Kuetz. Tab. Phyc. X, p. 22, t. 61. Hormosira? articulata 

 (Forsk.) Zanard. Plant Mar. Rub. p. 243, n. 35, De Toni Syll. Alg. 

 Ill, p. 1 88. Cystoseira (Hormophysa) articulata Kuetz., Okani. 

 List of Mar. Alg. col. in Caroline Islands and Australia, (Dot. Mag. 

 Tokyo Vol. XVIII, No. 209, 1904) p. 6, fig. 2-3. 



Root and Stem Fronds many times laterally branched 



on all sides, interruptedly winged on 2-3 sides, with wings truncated 

 at the upper side and cuneiform below, and dentate at margins, 

 producing branches from the axils of wings. Fronds attain the 

 height of 20-30 cm. with the wing, 10-13 mm. broad. Air-vessels 

 swollen in upper branches, ellipsoidal, trialated and chained, 5x8 

 mm. Conceptacles produced in the wings of vessels, with male and 

 female cells in the same conceptacle, containing one oosphere in an 

 oosporangium. Colour dark brown in dried specimens. Substance 

 leathery. 



Hab. : Okinawa and Heanza Isl. (Ryukyu). 



PL. CXIV. Fig. 1 : frond of Cystoseira articulata }. Ag., }. 

 Fig., 2 : branch reimmersed with conceptacles in the wings of 

 air-vessels, \. Fig. 3: three air-vessels with conceptacles, ^. Fig. 

 4: cross-section of an air-vessel showing conceptacles, f. Fig, 5 : 

 antheridia and oosporangium, 2 ^. 



