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DESCRIPTIONS OF THE PLATES. 



DESCRIPTION OF PLATE XVIII. 



Laboulbenia arcuata Thaxter. 



Figs. 1, 2. Two mature individuals. A 12. 



Fig. 3. Part of fertile branch with antheridium. D 12. 



Fig. 4. Spore pair. D 4. 



Laboulbenia macrotheca Thaxter. 



Figs. 5-7. Mature individuals. Fig. 6 the typical form. A 12. 

 Fig. 8. Spore. D 4. 



Laboulbenia Kunkeli (Giard). 



Fig. 9. Mature individual. A 2. 

 Fig. 10. Young individual. A 2. 



Laboulbenia palmella Thaxter. 



Figs. 11, 12. Two mature individuals, lateral and posterior views. A 2. 

 Fig. 13. Young individual with trichogyne. A 2. 

 Figs. 14, 15. Two youug individuals. A 2. 



Figs. 16-18. Anterior lateral and posterior views of tip of perithecium. D 2. 

 Fig. 19. Tip of branch of inner appendage bearing branch with antheridia. D 12. 

 Fig. 20. Spore. D 4. 



