206 BOTANICAL MAGAZINE. [Voi. xvii, 



12. The rhizoid cells showing the several stages of the development and 

 the localization of the starch grains, treated as in the preceeding. 

 x650. 



13. A zoosporangiom, each pyrenoid in the zoospores proves the existence 

 of the starch layer around the pyrenoid: treated as in the preceed- 

 ing. X 650. 



14. Internal cells with starch grannies filling up the upper compartments 

 X 650. 



15. ditto ; the pyrenoids are yet recognizable, x 650. 



16-19. Ecballocystis japonica. 



16. Thalli in habitual state : nat. size. 



17. A colony of cells with the gelatinous branches, stained with 

 methyl green. x285. 



18. Longitudinal section of a thallus near at the substratum to show 

 the filamentous processes of the rhizoid cells. x285. 



19. A rhizoid cell, the cell content has translocated downwards into 

 the tip of the process, leaving the original cell room filled with 

 gelatinous substance. The concentric zones of the gelatinous sub- 

 stance are clearly visible, x 650. 



20-26. Ecballocystis cava. 



20. Thalli in habitual state, nat. size. 



21. Longitudinal section of a thallus ; moderately magnified, 



22.. ditto ; at the substratum, showing the filamentous processes of the 

 rhizoid cells. The cell contents assume a rod-like form as the 

 cells progress downwards, x 165. 



23. A peripheral portion of fig. 22., treated with caustic potash and 

 iodine. The starch layers around the pyrenoids are stained in a 

 dark blue colour, x 650. 



24. Cells at the internal part of the thallus, showing the gelatinous 

 capsels around the cells ; the boundaries of the capsels stain in 

 a dark purple by iodine solution, x 285. 



25. A gelatinous branch, after boided in 50^ hydrochloric acid and 

 then stained with chloriodide of zinc, x 285. 



26. Longitudinal section of a fertile thallus with numerous zoosporangia. 

 X 165. 



A 



