39 



Dictyota dichotoma (Huds.) Lamour. 



Nonii Japi : Amidzi-giisa. 

 PL. CXI-CXIII. 



Dictyota dichotoma (Huds. Alg. Angl, p. 476], Lamour. Essai 

 p. 58, J. Ag. Sp. I, p. 92, Id. Till Alg. Syst. IV, p. 92., Id. 

 Anal. Alg. Cont., I, p. 67, Kuetz. Sp. Alg. p. 554, Id. Tab. Phyc. 

 IX, t. 10, De Toni Syll. Alg. Ill, p. 263, Engl. u. Prantl. Pflanzen- 

 fam. Algen, p. 297, fig. 189, Johnstone and Croall III, PI. CLVIII, 

 K. Okam. Alg. Jap. Exsic. No. 38. Zonaria dichotoma Harv. 

 Phyc. Brit. t. 103. Dictyota vulgaris Kuetz. Tab. Phyc. IX, t. 10. 

 D. altemiata and elongata Kuetz. 1. c. IX, t. u., D. latifolia and 

 affinis Kuetz. 1. c. IX, t. 12. D. acnta and volnbilis Kuetz. 1. c. 

 IX, t. 13. D. implexa and spiralis Kuetz. 1. c. IX, t. 14. D. 

 ornata Zanard. in Kuetz. IX, t. 26. Ulva dichotoma Lyngb. Hydr. 

 Dan., p, 31, t. 6c. 



Fronds more or less stupose at base, coespitose, rising from 

 a scutate disc, narrow or broadly linear, flat or torted, dichotom- 

 ous or dichotomo-pinnate, more or less expanding with erect or 

 patent elongato-cuneate segments, with margins entire or loaded 

 with proliferations, widely parted or emarginated at apices, ending 

 .n roundish-obtuse segments. Sori densely spread over both sur- 

 faces of frond leaving narrow marginal portions. Tetragonidial 

 sori elliptical at beginning, afterward becoming irregular in shape by 

 growing together. Oosporic sori minute dot-like and equally scat- 

 tered over both surfaces. Colour yellowish-green or more brownish. 

 Substance thin and membranaceous and plant imperfectly adheres to 

 paper in drying. 



PL. CXI CXV : September, 1913. 



