CONTENTS 



Cytology ......... 4 



The Fusion in the Ascus . . . . . . 4 1 



Fertilization ........ 4 1 



Development of the Ascus ...... 42 



Meiosis ......... 43 



The Third Division in the Ascus .... 44 



Chromosome Association ...... 45 



The Theory of a Single Nuclear Fusion ... 45 



The Significance of the Fusion in the Ascus . . 47 



Pseudapogamy . . . . . . . . 48 



Spore-Formation ....... 48 



Phylogeny ......... 49 



PLECTOMYCETES 55 



PLECTASCALES 56 



Endornycetaceae ........ 57 



Saccharomycetaceae ....... 62 



Gymnoascaceae ........ 66 



Aspergillaceae ........ 68 



Onygenaceae ........ 76 



Elaphomycetaceae and Terfeziaceae .... 77 



ERYSIPHALES 78 



Erysiphaceae ........ 79 



Perisporiaceae ........ 90 



Microthyriaceae ........ 91 



EXOASCALES 91 



Exoascaceae ........ 93 



DISCOMYCETES 95 



PEZIZALES 100 



Pyronemaceae ........ 101 



Pezizaceae ......... 107 



Ascobolaceae . . . . . . . .116 



Helotiaceae and Mollisiaceae ..... 122 



Celidiaceae, Patellariaceae and Cenangiaceae . . 124 

 Cyttariaceae . ... . . . . .125 



HELVELLALES 127 



Rhizinaceae . . . . . . . . .128 



Helvellaceae . . . . . . . .129 



Geoglossaceae . . . . . . . .131 



PHACIDIALES 132 



Stictaceae . . . . . . . ... 132 



Phacidiaceae . . . . . . . -133 



HYSTERIALES 133 



TUBERALES 135 



Tuberaceae . . . . . . . . 135 



