Plate XXII; Figures 145 to 151; Figures 147, 149, 151 

 Magnified 500 Diameters; Others iooo Diameters. 



Figs. 145, 146. Roya obtusa (Breb.) West . page 60 

 Fig. 147. Closterium acuminatum Kiitz. . 

 Fig. 148. lance qlatum Kiitz. 



Fig. 149. " Cucumis Ehrb. (?) 



Fig. 150. acerosum (Schrank) 



Ehrb. (?). With fungous growth 

 Fig. 151. Closterium acerosum (Schrank) 



Ehrb. (?). About to divide . 



