一 172 ― 



Gigartiiia intermedia Sur. 



Nam. Jap. : Aai-rwri. 

 PL. XXXV, Fig. 1-5. 

 iTigartina intermedia Suring. Alg. Jap. p. 30， t. XVII， B ； J， A さ. 

 Epicr. p. 204 (nomen) : De Toni Syll. Alg. IV， p. 199; Okam. A)g. 

 Jap. Exsic. (日 本 海藻 標 品)， Fasc. II， no. 53; 岡 村， 11 本 藻類 名彙, 

 p. 26. 



Fronas rorming low, pulvmate, densely overlapping masses, widely 

 stretched over rocks, firmly attaching to substratum by forming holdfasts 

 at the places where branches come in contact with it. Branches rising 

 from repenting segments, compressed, very irregularly branched in sub- 

 pinnate manner with strongly recurved, patent and furrowed branches, 

 ■which are often dilated into sublanceolate segments ending in a sharp 

 point. Branches adhere to each other and to substratum by the forma- 

 tion of attachments. Cystocarps almost globular, sessile, often a few 

 aggregating together along the margin of frond. Colour purplish red with 

 bluish iridescence. Substance strongly cartilaginous, and the plant im- 

 perfectly adheres to paper in drying. , 



Hab. : On rocks at high tide. Provs. Tosa, Shima, Sagami, and 

 Boshyu ； Hakodate. Fruits : ― early summar. 



Plants closely related to Gigartina tenella which has the structure of 

 frond more dense than in the present species, as it is seen from the 

 comparison of fig. 4-5 of PI. XXXV and fig. 4-6 of PI. XXXIII. 



PL. XXXV, Mg. 1-5. トは. 1 : fronds of o igartina intermedia Sur. 

 in nat. state and size. 一 Fig. 2: portion of frond detached, i.— Fig. 3: 

 portion of frond bearing cystocarps, f . ― Fig. 4: cross-section of lower 

 cylindrical portion of frond, -^. ― Fig. 5 : cross-section of compressed 

 portion of frond, 



