268 Explanation of PLales. 



PLATE LIII. 



(.4^ Figures x 500 unless otherwise stated.) 



USTILAGO AND CINTRACTIA. 



Fig. 



201. Sectioa tlu-ough axis of inllorescence of Andropogon australis affected by Cintractiu 



columellifera . . . . . . . . . . . . x 100 



202. Spores of same. 



203. Spores of Ustilago readeri germinating in water, showing early stages of germination 



with non-septate promycelium. 



204. Germinating spores of same further advanced, showing septate promycelia and 



formation of conidia. 



205. Germinating spores of same after eighteen hours in water, showing elongated 



promycelium septate towards the base, and protoplasm collected beyond septa. 



206. Spore of Ustilago calandriniae germinating in water, showing two septate promycelia 



from one spore and formation of conidia. 



207. Spore of Cintractiu densa germinating in water, showing septate promycelia and 



conidia. 



208. Two spores of Ustilago cynodontis germinating in nutritive solution, with two septate 



promycelia and lateral and terminal conidia (after Brefeld) . . X 350 



209. Spore of Ustilago cynodontis germinating in water. 



