76 



THE LOWER FUNGI—FIIYCOMYCETES 



and algae down to the level of the most primitive forms. An 

 interesting elaboration of this point is given by Ramsbottom 

 (1914). 



-4-^--^ 



Fig. 12.- — Pscudolpidiopsis schcnkinna (Zopf) v. Mindon in Spirofjyra. (a) 

 Encysted swarmsporcs germinating and acconiijlisliing infection, {h) Young 

 thallus developing from protoplast of s\varmsi)ore and still attached to the 

 empty cyst wall, (c-e) Mature swarmsporania. (/) After conjugation of 

 two young thalli in a host cell, (y) Mature resting spore with companion cell. 

 {h) Germinating resting spore. {After Zopf 18S4)- 



4. Pseudoipidiopsis v. Minden (1911: 255). 



syn. Diplophysa Schroter, subgenus Pleocystidium Fischer 

 (in Schroter 1892:85). 

 A single character, the presence of the companion cell on the 

 resting spore, serves to separate this genus from Olpidium. The 



