240 Exflanation of Plates. 



PLATE XXXIX. 



{AU Figures x 500 unless otherwise stated.) 



CINTRACTIA SORGHI- VULGARIS. 



Fig. 



102. Diseased grains of Andropogon sorghum, showing distortion produced by C. sorghi- 



vulgaris . . . . . . . . . . . . . . x 2 



103. Spores from same. 



104. Cross section through base of a rather young infected grain. Small portion of 



columella is represented at the base, then immature spores passing gradually 

 into the mature, and at the top the false membrane composed of epidermal cells 

 and sterile fungus threads (after Clinton) . . . . . . x 250 



105. Germination of spores in nutritive solution in different stages (after Bref eld) x 350 



106. Germination of spores after 24 hours in water (after Norton).. .. X 600 



