OBSERVATIONS OF THE GENUS PYTHIUM. 515 



may be formed in series of four or five, the apical one always 

 being the older, and will even become developed free in the 

 damp air of a moist chamber. The conidinm may pro- 

 duce either a germinal tube or zoospores on germination, much 

 as in the Peronosporese: after drying, however, the c o n i d i a 

 appear to lose their power of germinating altogether. 



As to the claim of this form to be considered a species 

 nothing further can be said^ so long as the sexual organs are 

 undiscovered. 



