DESCRIPTIOX OF PLATE II. 



1. Closed stoma. Peritheciiim of the cowpea fungus. Diameter of stoma proper, 

 45 n. James Island, S. C, August 29, 1895. 



2. Open stoma of the cowpea fungus, showing periphyses lining the inner wall 

 of the throat. Diameter of the stoma, 30 /<. James Island, S. C, August 29, 1895. 



3. Another A'iew of the periphyses, a portion of the inner wall of the neck of the 

 perithecium of the cowpea fungus crushed out and examined in water. James 

 Island, S. C, August 29, 1895. 



4. Optical section through perithecium from a dead watermelon stem, showing 

 cavity full of loose ascospores. Some of the asci remained, but the walls of most 

 had dissolved. This figure will answer equally well for the cotton or cowpea fungus 

 in each of which the same phenomenon was observed. Size, 320 by 280 >«. Slightly 

 diagrammatic. Monetta, S. C, September 9, 1895. 



5. Peridial cells in the middle or ventral portion of a perithecium of the cowpea 

 fungus. The same are shown less distinctly and somewhat diagrammatically in 

 Plate I, 1, and Plate V, 1. James Island, S. C, August 27, 1895. 



G. Conidial tufts on the surface of a watermelon stem killed by the internal 

 fungus. Monetta, S. C, July 16, 1894. 



7. Top of a similar tuft (melon fungus), showing attached and loose spores in 

 various stages of growth and septation. From a plant destroyed by soil infection. 

 Washington, D. C, September 27, 1894. 



8. Parenchyma cells from the living hypocotyl of a young watermelon, third day 

 of the wilt. Parenchyma partially occupied by conidia-bearing mycelium. No 

 fungus on the surface. In this cell there were 26 conidia. The section was jarred 

 repeatedly and somewhat roughly, and finally turned over without disturbing the 

 fungus. Undisturbed nonparasitized parenchyma cells were above and below it, and 

 the conidia were plainly inside of the cell here figured, which was from tissue near a 

 luugus-infested bundle. Hothouse experiment, Washington, D. C, April 10, 1895. 



9. An external, lunulate, 3-8eiitate conidium of the watermelon fungus after seven- 

 teen hours in acid cucumber agar. Twenty-four hours later numerous elliptical 

 conidia, like those shown in Plate I, 7, were abstricted. 



10. Hypha end, showing abstriction of the internal conidia from mycelium of 5, 

 forty eight hours after the latter was drawn. 



11. Internal conidia of cowpea fungus. These spores were taken from the vessels 

 of cowpea stems on James Island, S. C, August 7, 1895. Twenty-nine internal 

 conidia were measured that day, the size varying as follows: Length, 4.5 to 18yu; 

 breadth 2.3 to 4 /i. 



Figures transferred to the plate by Mr. Williams Welch, from camera drawings by 

 the author. 

 56 



