DESCRIPTIOX OF PLATE Y. 



1. Perithecium and ascospores from upland cotton. Salters Depot, Williamsburg 

 Co., S. C, Oct. 8, 1895. Size 352 by 272 /v. For comparison with PI. 1, 1, which, how- 

 t'ver, is less highly magnified. The ascospores of this perithecium were 10 by 10// 

 with a wrinkled esospore. Others on the same specimens were 9 by 9/^ More rarely 

 they were 9 by 10 /< or 9 by 11 //. 



2. Eipe ascus and paraphysis from the same lot of specimens as 1. A paraphysis 

 from a perithecium on cowpea was 18 n broad (cell next to the end cell). 



S. Macroconidia from conidia beds on the surface of killed stems of sea-island 

 cotton. James Island, S. C, June 29, 1895. All transitions between a and h were 

 observed. 



4. Internal or uiicroconidia from a diseased okra plant. James Island, S. C, July 

 25, 1895. Size 8 to 16 by 2.5 to 3.5//. This okra had been planted in place of cotton 

 which wilted and died early in the growing season. Many plants were affected. 

 The stems were 2 feet tall and about 1 inch in diameter at the base. The wood 

 was much browned the whole length of the stem. 



5. Macroconidia from external conidia beds on dead okra plants. James Island, 

 S. C, July 25, 1895. The mature spores measured 27 to 42 by 3 to 5 //. Occasionally 

 one was 5-septate. The vessels and parenchyma of these plants contained a great 

 amount of mycelium bearing such 8i)ores as are shown in 4. 



6. Highly magnified cross section of a pitted vessel which is beginning to be occu- 

 pied by the melon fungus. Stem of watermelou. Monetta, S. C, June 26, 1894. 

 Camera drawing from a fresh section examined in water. A great many of the ves- 

 sels were plugged solid by the fungus, as if stuffed with cotton. For the location of 

 these fungus-infested vessels with reference to other parts of the stem see Plate IV. 



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

 the author. 

 62 



