32 

 acntiloba Kuetz. Tab. Phyc. IX, t. 29 (non J. Ag.) 



Fronds caespitose, 15-20 cm. high, rising from decumbent and 

 densely intricated basal portions, linear, entire, 3-5 mm. broad 

 at basal portion, ^gradually tapering above, torted, dichotomo-decom- 

 pound, with the segments standing on patent or ereclo-patent 

 axils, furnished with simple or dichotomous proliferations on 

 both surfaces, divaricated and somewhat alternately arranged in 

 upper branches which end in slightly attenuated emarginate apices. 

 Tctrasporcs scattered over both surfaces of the frond. Colour 

 yellowish brown, becoming darker in drying. Substance mem- 

 branaceous and the plant imperfertly adheres to paper in drying. 



Hab. : On rocks near low tide. Ryukyu, Prov. Satsuma, Ushi- 

 buka in Amakusa Isl., Cape Nomo (Prov. Hizen), Aburatsu and 

 Bindare (Prov. Hyu n ;a), Mogi (near Nagasaki), Cape Shiwono-misaki 

 (Prov. Kii). 



PL. CVIII, fig. i-S. Fig. 1 : sterile frond of Dictyota dhari- 

 cata Lam., }. Fig. 2 : terminal portion of another plant from 

 Agincort I., \. Fig. 3 : cells of the internal layer seen through the 

 epidermis, just below the apex, ^. Fig. 4- : lower portion of the 

 frond in surface view, - r> *. Fig. 5 : portion of the frond bearing 

 letraspores, f. Fig. 6 : portion of the same, 4 1 ? . Fig. 1 : tetra- 

 sporangium, ^-If. Fig. 8 : hair-like roots emitted from the margin 

 of lower intertwined portion, -*. 



Dictyota divaricata Lamour. 



& *s <b b & a m /H- n- 



% CVIII ilJJS, i-8 H. 



m * m & y, T ^ na ->, * * E ^ m * ^ # 3 y $. ?, 



? , ffi JUc - * ? &> tia 3-5 mm T 9 , T B )K ? -> ? M -X * - 



