EXPLANATIONS AND REFERENCES, 

 PLATE CXXXI. 



Figures variously magnified. 



PAGE 

 Figs. 1, 2. BOTRYDIUM GRANULATUM, twice the natural size, . . 155 



Fig. 3. two empty cells, the tops collapsed, 155 



" 4-7. cells more highly magnified, show- 



ing the subterranean radicles, 155 

 " 8. cell-contents passing down into the 



radicles, . . .155 



%< 9. radicles developing zoospores, . 155 



" 10. " cell-contents scattering zoomicro- 



gonidia, . . . .155 



" 11. zoospores (sexual) highly magnified, 155 



" 12. asexual macrospores, . . 155 



" 13. zoospores developing in the radicles, 155 



" 14. radicle cells under greater magnifi- 



cation. . . . .150 



Figs. 15, 16. zoospores 4-6 days old, . . 156 



" 17, 18. " " 7-8 " " . . 156 



Fig. 19. zoospores germinating in radicles, 156 



" 20. zoospores developing into vegeta- 



tive plants, . . . 156 



Figs. 21, 22. asexual zoospores enlarging and 



producing sexual zoospores, . 156 



" 23, 24. sexual zoospores copulating, produc- 



ing isospores, (fig. 25), . . 156 



Fig. 26. isospores after a few days, becoming 



stellate, .... 156 



