THE PROBABLE NON-VALIDITY OF CERTAIN GENERA 33 1 
26. Taubenhaus, J. J. The Non-validity of the Genus Lasiodiplodia (abs.). 
Phytopathology 4: 47. 1914. 
27. Van Hall, A. E., Jonge, A. E., and Drost, A. W.* Dept. Agr. Suriname Bull. 
21. 1909. 
EXPLANATION OF PLATES XII-XIV 
Fig. I. Sweet potato inoculated with Diplodia gossypii. 
Fig. 2. Sweet potato inoculated with Lasiodiplodia theobromae. 
Fig. 3. Cross section of sweet potato inoculated with D. tubericola. 
Fig. 4. Surface view of same potato as in fig. 3. 
Fig. 6. Check, healthy sweet potato. 
Figs. 7 and 8. Sweet potatoes inoculated with L. tubericola. 
Fig. 9. Pure culture of D. tubericola, showing formation of pycnidia in plate. 
Fig. 10. Young culture of D. tubericola 3 days old. 
Fig. II. Young culture of D. theobromae, same age as in fig. 10. 
Fig. 12. Young culture of D. natalensis, same age. 
Fig. 13. Young culture of D. gossypii, same age. 
Fig. 14.2 Photomicrograph of a sweet potato section inoculated with D. tuberi- 
cola showing a group of pycnidia, — with and without paraphyses. 
Fig. 15. Photomicrograph of a sweet potato section inoculated with D. tuberi- 
cola showing a single pycnidium with paraphyses and hair at its neck. 
Fig. 16. Same material as fig. 14, showing pycnidia within the host. 
Fig. 17. Same material as fig. 14, showing scattered pycnidia without hair. 
Fig. 19. Same material as fig. 14, showing pycnidia single and in groups. 
Fig. 18. Same material as fig. 14, showing hairy necked pycnidia. 
Figs. 20 and 21. • Photomicrograph of a section of sweet potato inoculated with 
Diplodia gossypii, showing pycnidia embedded in a stroma, with paraphyses in the 
pycnidia. 
Figs. 22 and 24. Photomicrograph of a section of sweet potato inoculated 
with Diplodia gossypii, showing cespitose pycnidia borne upon the epidermis of the 
host as is the case with Diplodiella. In fig. 22, paraphyses are also seen in one 
pycnidium. 
Fig. 26. Same material as fig. 22, showing sparingly hirsute pycnidia. 
Fig. 27. Same material as fig. 22, showing paraphyses in the pycnidia. 
Fig. 23. Photomicrograph of a section of sweet potato inoculated with L, the- 
obromae, showing hirsute pycnidia. 
Fig. 25. Photomicrograph of a section of sweet potato inoculated with Di- 
plodia natalensis, showing hirsute sterile pycnidia. 
Figs. 14, 15, 16, 20, 21, 22, 23, 25, 26 and 27 were retouched with pen and ink 
in order better to show paraphyses, or hair, which the camera has failed to reproduce. 
2 Thanks are due to Dr. T. F. Manns for help rendered in making figs. 14 to 27. 
