LITERATURE CITED 209 



Stephanov, K. M., "Dissemination of infective diseases of plants by air 



currents," Bull. Plant Trot. Leningrad, Ser. 2, Phytopathology, 8: 1-68, 



1935. 

 Studhalter, R. A., and A. G. Ruggles, "Insects as carriers of the chestnut- 

 blight fungus," Pa. Dept. Agr. Forestry Bull., 12. 34 pp. 1915. 

 Ukkleberg, H. G., "The rate of fall of spores in relation to the epidemiology 



of black-stem rust," Bull. Torrey Botan. Club, 60:211-228, 1933. 

 Walker, Leva B., "Development and mechanism of discharge in Sphaero- 



bolus io<wemis, n. sp., and 5. stellatus Tode," /. Elisha Mitchell Sci. Soc, 



42: 151-178, 1927. 

 Walker, Leva B., and Emma N. Andersen, "Relation of glycogen to spore 



ejection," Mycol., 11: 154-159, 1925. 

 Ward, H. A I., "Researches on the life history of Hemileia vastatrix, the 



fungus of the coffee-leaf disease," /. Linn. Soc. Bot., 19: 299-335, 1882. 

 Weimer, J. L., "Some observations on the spore discharge of Pleurage curvi- 



cola (Wint.) Kuntze," Am. J. Botany, 7: 75-77, 1920. 

 Weston, W. H., Jr., "Repeated zoospore emergence in Dictyuchus," Botan. 



Gaz., 68: 287-296, 1919. 

 "Production and dispersal of conidia in the Philippine Sclerosporas of 



maize," /. Agr. Research, 23: 239-284, 1923. 

 Wolf, F. A., "Further studies on peanut leaf spot," /. Agr. Research, 5: 891— 



902, 1916. 

 Wolf, F. A., L. F. Dixon, Ruth McLean, and F. R. Darkis, "Downy mildew 



of tobacco," Phytopathology, 24: 337-363, 1934. 

 Wolf, F. T., and F. A. Wolf, "The snail Polygyra thyroidus as a myco- 



phagist," Bidl. Torrey Botan. Club, 66: 1-5, 1940. 

 Zalewski, A., "Uber Sporenabschnurung und Sporenabfallen bei den Pil- 



zen," Flora, 66: 268-270, 1883. 

 Ziegenspeck, H., "Schleudermechanismen von Ascomyceten," Botan. Arch., 



75:341-381, 1926. 



