EXPLANATIONS AND REFERENCES, 

 PLATE CCIX. 



PAGE. 

 Fit?. 1-3. CRENOTHRIX POLYSPORA, a section of filament with the cytio- 



plasin divided longitudinally, and 

 developed into spores ; some of them 

 developing clusters of filaments, 294 



4-9. Macrospores, or resting spores dividing and multiplying. . 294 



10. Part of a filament under higher power showing the formation of 



macrospores, ...... 294 



Figs. 11, 12. Macrospores sliding out of the sheaths, . . . 294 



Fig. 13. Microgonidia gathered into masses, forming a mucus around 



themselves, Palmella-like, ..... 294 



14. A small Palmetto, mass, gonidia developing into plants. . 294 

 15-17. Three sections of filaments under higher magnification, showing 



the division of the cytioplasm and formation of gonidia, 294 

 A frequent appearance of a caespitose cluster, . . . 294 



19. OSCILLARIA DETERSA . . . . .310 



Figs. 20, 25. ASTEROTHRIX PERTYANA, ..... 323 



22, 25. ASTEROTHRIX CBEQINII, . 322 



