PLATE 1 

 CHYTRIDIALES 



1. Plasmodiophora brassicae Woron. 



(Fitzpatrick The Lower Fungi, p. 57. after Chupp) 



a. Multinucleate myxamoeba in base of root hair of cabbage 



b. Spores and zoospores 



2. Sphaerita endogena Dangeard 



(Id., p. 72, after Dangeard) 



a. Spiny resting sporangium 



b. Young zoosporangiuni 



3. Olpidium endogenum A. Br. 



(Schroet. Nat. Ffl. p. 68, after A. P.raun) 

 a. Emptied zoosporangia x400 



4. Phlyctochytrium hydrodictyi (A. Br.) Schroet. 



(Id. p. 78, after A. Braun) 

 a. Zoosporangium x800 



5. Synchytrium decipiens Farl. 



(Fl. Nebr. pi. 15, after Farlow) 



a. Section of a gall 



b. Zoosporangium and zoospores 



6. Diplophysa saprolegniae (Cornu) Schroet. 



(Schroet., lb. p. 84, after Cornu) 

 a. Oosporangium 



7. Rhizidium mycophilum A. Br. 



(Id. p. 79, after Nowakowski) 



a. Zoosporangium with zoospores 



b. Resting sporangium with zoospore formation x400 



8. Rhizophidium ampuUaceum A. Br. 



(Id. p. 76, after A. Braun) 



a. Zoosporangia on an algal cell x300 



b. Zoosporangia x500 



9. Chytridium oUa A. Br. 



(Id. p. 80) 



a. Zoosporangia in host xZOO, after A. Braun 



b. Zoosporangia and oosporangia, after DeBary 



10. Obelidium mucronatum Now. 



(Fitzpatrick lb. p. 92, after Nowakowski) 

 a. Sporangium with zoospores escaping through a lateral pore 



11. Podochytrium clavatum Pfitz. 



(Id. p. 93, after Zopf) 

 a. Mature plant 



12. Polyphagus euglenae (Bail.) Now. 



(Schroet. lb. p. ^S, after Nowakowski) 



a. Zoosporangium with escaping zoospores x400 



b. Zoospore x350 



c. Oosporangia 



13. Catenaria anguillulae Sorok. 



(Fitzpatrick lb. p. 103, after Dangeard) 



a. Young thallus developed from zoospore 



b. Mature thallus with zoosporangia 



c. Zoosporangium with escaping zoospores 



14. Physoderma menyanthis DeBary 



(Scliroct. lb. p. 81, after DeBary) 



a. Mycelium and young sporangia x390 



b. Mature sporangia xl90 



