778 



AQUATIC PHYCOMYCETES 



Fig. 58. Woroninaceae 



A-C. Woronina polycystis Cornu in Saprolegniaceae : A, portion of hypha 

 ofAchlya; most of the many spherical sporangia in upper part have discharged 

 their zoospores; in basal segment sporangia are just beginning to form; B, 

 interpretation of zoospore according to Cook and Nicholson (1933); C, 

 cystosorus of small angular resting spores. D-E. Woronina glomerata (Cornu) 

 Fischer in Vaucheria: D, zoosporangium discharging its zoospores through 

 tube opening to outside of alga; E, germinating resting spore on which dis- 

 charge tube has been formed. F-J. Octomyxa achlyae Couch, Leitner, and 



