CONTENTS 



Cytology ...... 



The Fusion in the Ascus 

 FertiHzation ... 



Development of the Ascus . 

 Meiosis .... 



The Third Division in the Ascus 



Chromosome Association 



The Theory of a Single Nuclear Fusion 



The Significance of the Fusion in the Ascus 



Pseudapogamy 



Spore-Formation 



Phylogeny . 



PLECTOMYCETES 



PlECTASCALES 



Endomycetaceae . 



Saccharomycetaceae 



Gymnoascaceae . 



Aspergillaceae 



Onygenaceae 



Elaphomycetaceae and Terfeziaceae 



Erysiphales 



Erysiphaceae 



Perisporiaceae .... 



Microthyriaceae . 



Exoascales 



Exoascaceae 



DISCOMYCETES . 

 Pezizales . 



Pyronemaceae 



Pezizaceae . 



Ascobolaceae 



Helotiaceae and Mollisiaceae 



Celidiaceae, Patellariaceae and Cenangiaceae 



Cyttariaceae 



Helvellales 

 Rhizinaceae . 

 Helvellaceae 

 Geoglossaceae 



Phacidiales 

 Stictaceae 

 Phacidiaceae 



Hysteriales 

 Tuberales 



Tuberaceae . 



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lOI 



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 1^5 

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