182 



Ulva reticulata Forsk. 



Norn. Jap. : Ami-azvosa. 

 PL. C. Fig. 1-6. 



Ulva reticnlata Forsk. Fl. sEg. Arab. p. 187; }. Ag. Till Alg. 

 Syst. VI, p. 166 ; Zanard. PI. Mar. Ruhr. p. 294; De Ton! Syll. Alg. 

 I, p. 113 ; [3] /H", H ~Jf-7$k'$\$3 &i, P- 1 66. Phycoseris reticulata Kuetz. 

 Tab. Phyc. VI, t. 29 ; Id. Sp. Alg. p. 478. 



Fronds deeply and irregularly laciniated with laciniae undulato- 

 torted and perforated by pores of different sizes. Thus the plant is 

 like a broken network whose meshes are produced by local decaying 

 of cells and confluence of pores thus formed. The natural or free mar- 

 gin, which is original and not secondarily produced by perforation, is 

 provided with microscopical teeth set at different intervals. Cells are 

 isodiametrical or a little longer as broad and the outer side is much 

 thickened. Colour- bright green. Plant imperfectly adheres to paper. 



Hab : Ryukyu. 



PL. C. Fig. 1 : frond of Ulva reticulata Forsk., -3-. Fig. 2 : 

 cross-section of frond, - . Fig. 3 : surface-view of frond, ^~. Fig. 

 4- : portion of frond ; a : original margin ; b : margin formed by perfora- 

 tion ; -~. Fig. 5 : surface-view of frond showing the beginning of a 

 pore by the decaying of cells, i^p-. Fig. Q, a-d : different forms of 

 teeth, -42. 



Ulva (Linn. 1737) Wittrock. 



& & 3 J. 

 ULVACEAE. fo % ? ^. 



ss - & &, w ? i JR - -> ? to ^ = m ^ v,~m; mm 3 ") & 



/" ; *B m - T 5 ^ * s J&rft&ftTfr- * f % *J g? * > T 31$ 



