EXPLANATIONS AND REFERENCES, 

 PLATE XCVI. 



PAGE.' 



Fig. 1. STIGEOCLONIUM THERMALE, a well-developed plant, . . Ill 



Figs. 2, 3. Microzoosporangia, . . . . .111 



" 4, 5. Microspores escaping and enlarging, . . .111 



Fig. 6. A large sporangium, . . Ill 



" 7-9. Early growth of Stigeoelonium, . . . . .111 



" 10. STIGEOCLONIUM NANUM, ..... 112 



" 11. STIGEOCLONIUM TENUE, . . . . .111 



" 12. " " Var. bulbi/erum, . Ill 



" 13-16. The bulbous cells, . Ill 



