458 



Rotula Hass. See 



XCII. Fig. 7. 

 simplex Hass. 

 simplex Meyen 

 tetras Ralfs 

 tricyclium Hass. 



PENTASTERIAS Ehr. 

 arachnis Hass. 

 Jenneri Hass. 

 margaritaceum Ehr. 



PETALONEMA Berk, 

 alatum Berk. 



Phormidium Kiitz. 



Pleurococcus Menegh. 

 glomeratus ? Menegh 

 murorum Menegh. 

 therrnalis Menegh. 

 vulgaris Menegh. - 



PODOSPHENIA Ehr. 



? oculatum Hass. - 



Polycoma Pals. 



Polysperma Vouch. 



fluviatilis Vauch. - 



Prasiola Kutz. 



Prolifera Vouch. 



Borissii Le Clerc - 

 Boscii Le Clerc 

 Candollii Le Clerc 

 composita Le Clerc 

 Cuvieri Le Clerc - 

 rivularis Le Clerc 

 Rothii Le Clerc - 

 Vaucherii Le Clerc 



PROTOCOCCUS Ag. 

 4- nivalis Ag. 



R. 



RAPHIDIA Carm. 



angulosa Hass. 



biridis Hass. 



natans Carm. 

 RIVULARIA Roth. 

 4- angulosa Roth. 



botryoides Ag. 



crustaceum Carm. 



