CONTENTS 



CHAPTER PAGE 



I. Biology of the Uredine.^ — Introductory Remarks ... i 



II. AIycelium of the Uredine.^ ... ... ... 4 



III. Spermogonia and the so-called Sperm atl\ ... ... 9 



IV. ^cidiospores ... ... ... ... ... 21 



V. Uredospores ... ... ... ... ... ... 28 



VI. Teleutospores ... ... ... ... ... 36 



VII. Hetercecism ... ... ... ... ... ... 46 



VIII. Mycelium of the Ustilagine/e ... ... ... 58 



IX. Formation of the Teleutospores of the Ustilagine/e 61 



X. Germination of the Teleutospores of the Ustilagine.^ 72 



XI. Infection of the Host-Plants by the Ustilagine/e 99 



XII. Spore Culture ... ... ... ... ... 105 



XIII. The Artificial Infection of Plants ... ... 114 



Descriptions of the British Uredine^ ... ... ... 119 



Appendix — Imperfect Forms, of which the Full Life-History 



is unknown ... ... ... ... ... ... 254 



Descriptions of the British Ustilagine/e ... ... 272 



Supplement — Allied and Associated Species ... ... 297 



The Barberry Law of Massachusetts ... ... ... 302 



Glossary ... ... ... ... ... ... ... 305 



Authors Quoted ... ,. ... ... -... 309 



Description of Plates ... ... ... ... ... 317 



Index of Host-Plants ... ... .., ... ... 325 



Biological Index ... ... ... .. ... ... 331 



Index of Species ... ... ... ... ... 339 



