EXPLANATIONS AND REFERENCES, 

 PLATE CLXXV. 



PAGE. 

 Fig. 1-3. MASTIGONEMA AERDGINEUM, developing from spores; different 



stages of advancement . 241 



" 4. developing tolypothrix, . . 241 



Figs. 5, 6. '' other developing forms, . 241 



Fig. 7. developi ng conditions; short flagel- 



liform, then elongating changing 

 to linear, . . . .241 



'' 8. positions of trichomes changed 



from younger cluster, fig. 9, . 241 



" 9. " " younger condition than fig. 8, 241 



" 10. condition surrounded by many 



spores, after development of fila- 

 ments, . . . .241 



"11. an occasional condition of a fila- 



ment under higher power, . 241 



Fig. 12-14. a larger form from New Jersey, 



others, fig. 14, from Florida, . . 241 

 " 15-17. more scattered trichomes, 



