50 



Many practical questions are left for further investigation, especially 

 all that relates to cotton. 



EXSICCATI. 



Specimens of this fungus will be distributed in Ellis and Everhart's 

 Fungi Columbiana (Century 15). These sets include only the fungus as 

 it occurs on cowpea and on culture media derived from this source. 

 These specimens will consist of the following material : [a) Perithecia on 

 stems and roots of the cowpea {Vigna sinensis)', {h) pure cultures of 

 immature perithecia grown in the laboratory from ascospores sown on 

 steamed sterile potato; (c) ripe perithecia from pure cultures on 

 steamed potato; {d) stems of cowpea with the vascular system plugged 

 by the white fungus, which bears microcouidia (these stems were 

 green when gathered and bore no external conidia beds, but in many 

 instances, to my chagrin, the fungus pushed through and fruited 

 on the surface while the stems were drying); (e) external salmon- 

 colored conidia beds (macroconidia) on stems previously killed by the 

 internal fungus and which were dry when gathered. Type specimens 

 have been deposited in the cryptogamic herbarium of the Division of 

 Vegetable Physiology and Pathology, United States Department of 

 Agriculture, and these specimens, which have been selected with equal 

 care and are of equal value, may be regarded as co-types. 



PREVIOUS LITERATURE. 



(1) Atkinson. Fusarium vasinfecium. ' Some Diseases of Cotton. Bull. No. 41, Dec, 

 1892, Agricultural Experiment Station, Auburn, Alabama, pp. 19 to 29, with 3 

 figures : a diseased leaf, internal mycelium in vessels of cotton plant, mycelium 

 and conidia from cultures. 



(2) Atkinson. Diseases of Cotton iu "The Cotton Plant," a Bulletin (No. 33) issued 

 by the Office of Experiment Stations, Dep. of Agric, Washington, D. C, 1896, pp. 

 287-292. Nothing new added. 



(3) Smith. Fasarium tiiveum. The Watermelon Disease of the South. Proc. Am. 

 Asso. Adv. Science, 1894, p. 289. 



(4) Smith. NectrieUa tracheiphila. The Watermelon Wilt and other Wilt Diseases 

 due to Fusarium. Proc. Am. Asso. Adv. Science, 189.5, p. 190. 



(5) Smith. The iiath of the water current in cucumber plants: (5) The result of 

 parasitic plugging of the vessels. American Naturalist, 1896, p. 561. 



(6) Smith. The Spread of Plant Diseases: A consideration of some of the ways in 

 which parasitic organisms are disseminated. Tr. Mass. Hort. Soc, 1897. 



