TABLE OF CONTENTS. 



pa<;e 



INTRODUCTORY NOTE 193 



PART I. 



■ 



Gkneral Characters of the Laboulbeniaceje 197 



Historical Summary 199 



General Morphology and Development 202 



The Spores. Their formation, mode of transference, and germination. Development of the 



.foot; its modifications and function 202 



The Receptacle. How it is characterized in general. Its simplest type and some of its 



modifications 206 



The Appendages. The general structure, origin, and significance of the sterile and fertile 



forms , » 207 



The Male Sexual Organs. Their general character, relation to the appendages and 

 systematic significance. Antheridia producing antherozoids (a) exogenously, and (b) 

 endogenously. The two types of antheridia occurring in the latter category .... 209 

 The simple antheridium. Its development, structure, and the production from it of 

 antherozoids ,* its variations in form ; its disposition on the appendages either 



definite or indefinite 211 



The compound antheridium. Its structure compared with that of the simple anthe- 

 ridium ; the relative frequency of its occurrence ; its detailed structure as illustrated 

 by the genus Dimeromyces ; variations of this type of structure in other genera ; 



its more complicated form in Haplomyces and Cantharomyces 214 



Relation in position of the antheridia to the female organ and the probable existence 



of cross-fertilization : duration of the period of functional activity in either type . 216 

 The antlierozoids. Their exogenous or endogenous origin and mode of production in 



either case ; their cell characters and rate of discharge 216 



The Female Sexual Organs. Their origin and detailed development as illustrated by 

 Stigmatomyces : they consist primarily of two superposed cells ; the primordial cells of 

 the perithecium and of the procarpe, respectively. Development of the procarpe and 

 young perithecium from these primordial cells ; their component parts, form, and rela- 

 tions. Fertilization of the trichogyne and the accompanying changes in the young peri- 



