30 



as broad, arranged in 5-6 longitudinal rows between both margins in 

 the narrower portions and are very translucent in younger portions. 

 Breadth of segments are 0.3-2 mm. Colour yellowish brown or 

 greenish-olive. Substance thin membranaceous and the frond adheres 

 to paper in drying. 



Hab. entangled on the fronds of Sargassum tortile in 3-4 

 fathoms at Ushijima in Prov. Sanuki ; No, Teradomari and Awo- 

 shima (Prov. Yechigo), Sado. 



PL. CVII. Fig. 1-2 : sterile fronds of Dictyota lincaris (Ag.) 

 Grev. from Prov. Sanuki, \. Fig. 3 : portion of the same (^ mm. 

 in breadth) with hairy roots, ?. Fig. 4 : terminal segments of tl-.e 

 same showing hairs and rudimentary roots on both surfaces of the frond, 

 \ Fig. 5 : terminal portion of a frond from Prov. Sado with broader 

 segments, \ Fig. 6: cells of the internal layer seen through the 

 epidermis of the portion at the second fork from the apex, -*. Fig. 

 7 : surface view of the epidermal cells, a little below the apex, ^, 

 Fig. 8 : cross-section of frond with hairy roots from the under surface, 

 S 1 . Fig. 9 : beginnings of hairy roots, -;[-. 







Dictyota linearis (Ag.) Grev.* 

 I* i> & ? IS] # ffi. 



ig cvii JR. 



fj 3 j> ^ / #u * ^ 7 a i/ ? a ^ -^f % v Ws ^L ^ ; # ^ j 

 v' 7 ii? v' ^ iM v, g$ [ifl ^ ^' |)3 c/.fft ^ il; f jfl - -v r ^9 jf| / m 



)S; JfS * ^ ^ > -t n& ^ ^. -* % ffi ^ iH, I'J - Jl M D3 ^ ^ life 5JI . 



* Dictyota (, fc /> V C SI) /ttl-^ '6 H = 7 



