Captions for Illustrations 



Plate 1. 



Shapes of cysts of Heterodera species. Fig. 1. 

 H. rostochiwnsis * Fig. 2. H. punctata . Fig, 3. 

 H. schachtii. Fig. U. H. avena e . Fig. 3. H. weissi , 

 FIp. 6. H. cacti. 



Plate II. 



Cyst patterns of Heterodera schachtii and related 

 species. Figs. 7 and b. Zig-zag line pattern near 

 middle of cysts of H. trifolii and H. schachtii 

 respectively. Fig. 9« Pattern at junction of neck and 

 body of cysts of H. schachtii . Fig. 10. Pattern near 

 vxilva of cyst of H. gottingiana . Fig. 11. Sheaf- 

 shaped object and dark bodies at lower end of cyst 

 of H. schachtii. Fig. 12. Network pattern, a 

 varTation of that shown in Figs. 7 and 8. Magnifi- 

 cation of figure 11 is about 200X, all other about 



iaox. 



Plate III. 



Cyst markings of Heterodera weissi and H. cacti. 

 Fig. 13. Lower part of cyst of H. cacti . Fig. lU. 

 Pattern near middle of cyst of H. weissi. Fig. 15 • 

 Pattern at junction of body and neck of H. weiss i. 

 Fig. 16. Pattern near middle of cysts o7 H. cacti. 

 Fig. 17. Lower end of cysts of H. cacti showing 

 anus. Fig. I8. Grainy appearance of cyst of H, 

 cacti. Ail about UIOa. 



PUte IV. 



Cyst patterns and punctation of Heterodera rostochiensis 

 and H. punctata . Fig, 19. Pattern at vulva and anus 

 of H. rostochiensis . Fig. 20. Same as Fig. 19, but 

 with deeper focus to show ptinctation. Pig. 

 and vulvar openings of cyst of H, punctata. 

 split in process of preparationj. Fig. 22. 



21. Anal 

 (Cyst 

 Pattern 



. Fig. 23. 



at about middle of cyst of H. rostochiensis , 



Pattern of upper part of cyst of H. punctata. Fig. 2U. 



Punctation of H. rostochiensis. All about UlOX. 



Plate V. 



Cysts and eggs of Heterodera species. Fig. 25, 

 Pionctation of cyst of H. avenae. Fig. 26. Puncta- 

 tion and pattern of cyst of H, humuli . Fig. 27. 

 Punctation of cyst of H. triTolii . Fig. 28. Puncta- 

 tion of egg shell of H. cacti. 



h 



