INTRODUCTION 



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Fig. 70. Pezizales, Family Pezizaceae. Pyronema omphalodes (Bull, ex Fr.) Fckl. 

 Sexual reproduction. (A) Group of antherids and oogones. (B) Section through 

 oogone, trichogyne, and apex of antherid, showing opening of latter into the tricho- 

 gyne. (C) Similar section, later stage, showing a young, forked, ascogenous hypha. 

 (D) Ascogenous hypha from oogone to ascus. (E) Ascogenous hypha showing two 

 hooks. (F) Young ascus with its single diploid nucleus. (A, B, E, F, after Harper: 

 Ann. Botany, 14(55) :32 1-400. C-D, after Claussen: Z. Botan., 4(l):l-63.) 



