226 Explanation of Plates. 



PLATE XXXII. 



{All Figures x 500 unless otherwise stated.) 



USTILAGO AND CINTRACTIA. 

 Fig. 



48. Spores of Cintractia spinificis from Spinifex hirsutus. 



49. Spores of U. slenotaphri from Stenotaphrum americanum. 



50. 51. Spores of U. utriculosa. Surface view showing the reticulated markings. 



52. The same, sectional view. 



53. Portion of inflorescence of Polygonum affected by U. hydropiperis var. columdlifera 



Tul. Note the black columella projecting from each floret . . nat. size 



54. Section towards base of columella of same. The dark crescent-shaped portion 



represents the nearly-mature spores, the paler portions the immature spores in 

 process of formation . . . . . . . . . . . . X 20 



55. Spores of same on Polygonum from Tasmania. 



56. Spores of U. hydropiperis from Rabenhorst's Fungi Europaei, No. 2390. 



