CATALOGUE OF PLANTS. 615 



RHAPHIDIUM, Kutz. 

 R. polymorphum, Fres. 



In stagnant waters. 

 R. convolufrum (Corda), Rab. 



Same habitat. 



DIMORPHOCOCCUS, A. Br. 

 D. cordatus, Wolle. 



Free-swimming in ponds. 



ERBMOSPH-aSRA, De By. 



B. viridis, De By. 



In small pools ; frequent. 



(PLEUROCOCCUS is not regarded as a valid genus] 



CHYTBIDIE^E. 



(An order of questionable affinities.) 



OHYTRIDIUM, A. Br. 



C. acuminatum, A. Br. 

 C. globosum, A. Br. 



Parasitic on various fresh-water algae. 



CLASS 3.-ACHLOROPHYLUE. 



SACCHAROMYCETES. 



(Ferments.) * 



SACCHAROMYOBS, Meyen. 

 S. cerevisise, Meyen. 



The Yeast Plant, which causes the fermentation of saccharine 

 solutions, producing alcohol with the accompanying disengage- 

 ment of carbonic acid gas. 



*Only the most common and best-known forms are here enumerated. 



