EXPLANATION OF PLATES. 



[Plates I, II, and III are from photomicrographs made by Mr. Lon A. Hawkins, of the Office of Fruit-Disease 

 Investigations. All asci are magnified 450 diameters and the separate ascospores 700 diameters.] 



Plate I. Figs. 1 to 15. — Photomicrographs of asci and ascospores of Glomerella, from 

 various hosts. Fig. 1. — From grape. An ascus from a glycerin mount stained 

 in eosin, from dried corn-meal culture 325d. Fig. la. — From grape. Ascospores 

 from a fresh glycerin mount, unstained, from corn-meal agar culture 1373b. 

 Fig. 2. — From grape. An ascus from a fresh glycerin mount stained in gentian 

 violet, from a corn-meal agar culture 1238h. Fig. 2a. — From grape. Ascospores 

 from same culture as figure 2. Fig. 3. — From apple. An ascus from a fresh glyc- 

 erin mount stained in eosin, from a dried specimen on fruit. Fig. 3a. — From 

 apple. Ascospores from same source as figure 3. Fig. 4. — From cranberry. An 

 ascus from an old mount, unstained, from culture 756 from skin and pulp of New 

 Jersey berry. Fig. 4a. — From cranberry. Ascospores from same mount as figure 

 4. Fig. 5. — From black raspberry. An ascus from a 2-year-old formalin mount, 

 unstained, from plate culture from canes from Shelbyville, Tenn. Fig. 5a. — 

 Ascospores from the same mount as figure 5. Fig. 6. — From pomelo. An ascus 

 from a formalin mount 2 years old, unstained, from a leaf from a greenhouse of 

 the Department of Agriculture, kept in a moist chamber. Fig. 6a. — Ascospores 

 from the same mount as figure 6. Fig. 7. — From lemon. An ascus from a mer- 

 curic chlorid mount 1 year old, unstained, from a leaf from the Department green- 

 house, kept in a moist chamber. Fig. 7a. — Ascospores from the same mount as 

 figure 7. Fig. 8. — From orange. An ascus from a glycerin mount, stained with 

 eosin, from a leaf from the Department greenhouse, kept in a moist chamber. 

 Fig. 8a. — Ascospores from the same mount as figure 8. Fig. 9. — From gua^va. 

 An ascus from a fresh glycerin mount from dried specimen, unstained, from a 

 leaf from the Department greenhouse, kept in a moist chamber. Fig. 9a. — Asco- 

 spores from a fresh glycerin mount from a dried specimen, stained in eosin, from 

 a leaf from the department greenhouse, kept in a moist chamber. Fig. 10. — 

 From avocado. An ascus from a mercuric chlorid mount 1 year old, unstained, 

 from leaves from the Department greenhouse, kept in a moist chamber. Fig. 

 10a. — Ascospores from the same mount as figure 10. Fig. 11. — From loquat. An 

 ascus from a glycerin mount, stained with eosin, from a leaf from the Department 

 greenhouse, kept in a moist chamber. Fig. 11a. — Ascospores from the same 

 mount as figure 11. Fig. 12. — From cotton. An ascus from an old slide, unstained, 

 from a culture. Fig. 12a. — Ascospores from the same slide as figure 12. Fig. 

 13. — From bean. An ascus from an old formalin mount, unstained, from corn- 

 meal culture 485a, from bean pods from Takoma Park, Md. Fig. 13a. — Asco- 

 spores from corn-meal culture 484 from same source as figure 13. Fig. 14. — 

 From coffee. An ascus from a fresh glycerin mount from a dried specimen, 

 stained in eosin, from a leaf from the Department greenhouse, kept in a moist 

 chamber. Fig. 14a. — Ascospores from a fresh glycerin mount, stained in eosin, 

 from a leaf from the Department greenhouse, kept in a moist chamber. Fig'. 15. — 

 From camellia. An ascus from a fresh glycerin mount from a dried specimen, 

 unstained, from a leaf from the Department greenhouse, kept in a moist chamber. 

 Fig. 15a. — Ascospores from a fresh glycerin mount from a dried specimen, un- 

 stained, from a leaf from the Department greenhouse, kept in a moist chamber. 

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