CHYTRIDIALES 



69 



4. Woronina Cornu (1872: 114). 



The thallus in early stages is obscured by the protoplasm of 

 the host, but later appears as a naked protoplast of variable form. 

 The host lays down transverse septa confining it to a definite 



Fig. 8. — Rozella scptigena Cornu in hyphae of Saprolegnia. (a) Linear series 

 (sorus) of sporangia of Rozella in end of host hypha, lower three fully formed, 

 terminal three developing at expense of host protoplasm, (b) Similar sorus, 

 the terminal sporangium of which is freeing swarmspores. (c) Single terminal 

 sporangium; the wall of the parasite distinguishable from that of the host where 

 the lateral exit papillae are pushing out. ((/) Swarmspores. (c) Spiny resting 

 spores of Rozella lying in lateral host branches which are perhaps oogonia. (After 

 Cornu 1872.) 



short cell or compartment. Several such cells enclosing different 

 thalli may form a linear series. At maturity the thallus, having 

 absorbed completely the protoplasm of the host cell, fragments, 

 forming a number of globose sporangia each of which then 



