xii TABLE OF CONTENTS 



CHAPTER II 



THE PERENNIAL PSEUDORHIZA OF COLLYBIA FUSIPES 



PAGE 



Introduction — Historical Remarks — Fruit-body Clusters and their Pseudo- 

 rhizae — The Supposed Sclerotium — Evidence that the Pseudorhiza 

 Persists — Mode of Development of a Compound Pseudorhiza — Lateral 

 Grafting — Healing of Pseudorhizal Wounds — The Mycelium and the 

 Problem of Parasitism — The Functions of the Pseudorhiza and the 

 Significance of its Persistency — Sarcoscypha protracta .... 374 



CHAPTER III 



OMPHALIA FLAVIDA, A GEMMIFEROUS AND LUMINOUS LEAF-SPOT 



FUNGUS 



Introduction — Omphalia flavida and the American Coffee-leaf Disease — 

 Stilbum flavidum as a Stage in the Life-history of OmpJmlia flavida — The 

 Structure of the so-called Stilbum-hody — The Omphalia flavida Sporophore 

 — The Origin of the Stilbum-hodies — The Stilbum-hody as a Gemmifer — The 

 Basal Curvature of the Pedicel and its Significance — The Sigmoid 

 Curvature of the Pedicel and the Abscission of the Gemma — The Detach- 

 ment of a Gemma from its Pedicel — The Attachment of a Gemma to a 

 Leaf — Mode of Germination of a Gemma — The Effect of Desiccation on 

 the Vitality of a Gemma — Inoculation Experiments with Living Leaves — 

 Omphalia flavida as a Non-specialised Parasite — Sterility of the Mycelium 

 Induced by Prolonged Cultivation on Artificial Media — The Effect of 

 Light on the Formation of Gemmifers — Luminescence of the Mycelium 

 and its ^'alue as a Diagnostic Character of the Coffee-leaf Disease — Tlie 

 Gemmifers of Sclerotiutn coffeicola ....... 397 



GENERAL SUMMARY : 



Part I ........... . 455 



Part II . 462 



Part III 408 



GENERAL INDEX 473 



