xiv CONTENTS 



CHAPTER IV 



PAOE 



THE FUNGI . . .216 



Type XVIII 



PYTHIUM BARTANUM ...... 218 



1. Structure ...... 219 



2. Reproduction 



a. Asexual . . . . . . 221 



b. Sexual . . . . . .224 



Type XIX 



PlLOBOLUS CRYSTALLINTJS ...... 228 



1. Structure . , . . .229 



2. Reproduction 



a. Asexual . . , , . 230 



b. Sexual . .. . . . ,233 



Type XX 



SPH^ROTHECA CASTAGNEI 



1. Structure ...... 235 



2. Reproduction ...... 237 



Type XXI 



PHYSCIA PARIETINA ...... 240 



1. Structure and Mode of Life .... 241 



2. Reproduction ...... 247 



Type XXII 



PUCCINIA GRAMINIS . . . . . .251 



Type XXIII 



THE MUSHROOM (Agaricus campestris) , , , . 264 



