EXPLANATIONS AND REFERENCES, 

 PLATE OLXXIII. 



PAGE 



Figs. 1, 2, 3. CALOTHRIX GRACILIS, differs from C. Dillwynii mainly in size, 237 

 " 4, 5. CALOTHRIX AERUGINEUM, young and matnrer forms from Florida,242 

 Fig. 6-8. MASTIGONEMA SEJITNCTUM, younger isolated trichome ; section 



of matured plant, and full grown 

 plant, . . . .243 



" 9. " " a small tuft, . . . 243 



