xii TABLE OF CONTENTS 



PAGE 



Protoplasm — Causes of Streaming — biological Significance of Streaming — 

 Rate of Growth of the Mycelium in a Dung-agar Plate — Observations with 

 Dark-field Illumination — Woronin Bodies and their Movements — Pore 

 Plugs and their Formation under Experimental Conditions — Formation 

 of Pore Plugs in Old Mycelia when Individual Cells Die — Pore Plugs in 

 Other Fungi — The Origin of Intrahyphal Hvphae from Septal Walls and 

 their Growth through Older Dead Hyphae under Experimental Conditions 

 — Ascophanus carneus — A Ciboria on Male Birch Catkins — The Hymeno- 

 mycetes — Mycetozoa and Fungi — Phycomycetes compared with Asco- 

 mycetes and Basidiomycetes — The Biological Significance of Septa in the 

 Mycelium of the Higher Fungi — Time taken for the Formation of a 

 Septum — Temporary Bulging of Septa toward Growing Points — The 

 Passage of Nuclei through the Haploid Mycelium of Hymenomycetes during 

 the Diploidisation Process ........ 75 



PART II 



THE PRODUCTION AND LIBERATION OF SPORES IN CERTAIN 

 NON-HYMENOMYCETOUS BASIDIOMYCETES 



CHAPTER I 



SPOROBOLOMYCES, A BASIDIOMYCETOUS YEAST-GENUS 



Introduction— Cultures— Spore-deposits— Method of Observing the Develop- 

 ment and Discharge of the Spores — Observations on the Development of 

 Sporobolomyces Colonies— The Production and Violent Discharge of the 

 Spores — Abnormal Drop-excretion — The Successive Production of Spores 

 on One and the Same Sterigma — The Successive Production of Spores on 

 Two or More Sterigmata— Nuclear Phenomena— The Taxonomic Position 

 of Sporobolomyces . . . • • • • • .171 



CHAPTER II 



THE VIOLENT DISCHARGE OF THE BASIDIOSPORES (SECONDARY CONIDIA) 



OF TILLETIA TRITICI 



By A. H. R. Butter and T. C. Vanterpool 



Introduction— Bunted Ears and Grains of Wheat — The Germination of the 

 Chlamydospores on Agar — Variations in the Development of the Primary 

 and Secondary Conidia — External Conditions and the Germination of the 

 Chlamydospores — The Development and Discharge of Secondary Conidia 

 ' — Discussion of the Significance of Violent Spore -discharge in Tilletia 

 tritici— Terminology, New and Old— Nuclei and Sex— Abnormal Basidio- 

 spore-discharge — A Basidiospore-discharge Method of making Pure 

 Cultures— Basidiospore-deposits — The Development and Discharge of 



