422 



DESCRIPTIONS OF TIIE PLATES. 



DESCRIPTION OF PLATE XX. 



Laboulbenia Brachini Thaxter. 



Fig. 1. Short form with appendages well developed. A 12. 



Fig. 2. Elongate form with exceptionally simple appendages. A 12. 



Figs. 3, 4. Young individuals. D 2. 



Figs. 5, G. Young individuals. D 4. 



Fig. 7. Fertile branch with characteristic group of antjheridia. D 12. 

 Fig. 8. Spore. D 4. 



Fig. 9. Mature individual with abnormal septa in cells I and II. A 12. 



Fig. 10. Mature individual, shorter form. A 12. 



Fig. 11. Fertile appendage with two antheridia. D 12. 



Fig. 12. Spore pair. D 4. 



Laboulbenia Pachytelis Thaxter. 



Laboulbenia Pheropsophi Thaxter. 



Fig. 13. 

 Fig. 14. 

 Fig. 15. 



Mature individual. A 12. 

 Antheridium. D 12. 

 Spore pair. 



Laboulbenia texana Thaxter. 



Fig. 16. 

 Fig. 17. 

 Fig. 18. 



Mature individual. A 12. 

 Young individual. A 12. 

 Antheridium. D 12. 



Laboulbenia decipiens Thaxter. 



Fig. 19. 

 Fig. 20. 

 Fig. 21. 



Mature individual. A 12. 

 Antheridium. D 12. 

 Spore. D 4. 



