EXPLANATIONS AND REFERENCES. 



PLATE LXXVII. 



Figures magnified 250 diameters. 



PAGE. 



Figs. 1, 2. OEDOGONIUM PLATYGYNUM, two sections of filaments, . . 75 



" 3, 4. transverse sections of oogonia, . 75 



" 5, G. OEDOGONIUM DECIPIENS, . . 70 



Fig. 7. OEDOGONIUM ARESCHOUGII, . . 76 



" 8. OEDOGONIUM UNDULATUM, . 70 



Figs. 9, 10. OEDOGONIUM LUNDENSK, . . 79 



Fig. 11-18. OEDOGONIUM PYRIFORME, . . 95 



" 14-10. OEDOGONIUM CRASSIUSOUT.UM, ... 80 



17. an oospore surrounded by sper- 



matozoides, active in the space 

 between the spore and the mem- 

 brane of the oogonium, . 80 

 Figs. 18, 19. Sections of filaments of male plants constituting the idioandro- 



sporous form of the species, . ... 80 



