VI CONTENTS. 



CHAPTER IV. FECUNDATION; HETEROGAMETES. 



Sphaeroplea, . 79 



Fucaceae (Fucus, Halidrys), . ... 84 



Volvox, . . . ... ' 88 



(Edogonium, . ... 89 



Coleochaete, . 91 



Vaucheria, . .94 



Albugo (Cystopus), . . 96 



Achlya and Saprolegnia, . 102 



CHAPTER V. TYPE OF THE ASCOMYCETES AND RHODOPHYCE^E . 



Sphaerotheca, 108 



Pyronema, 1 1 1 



Batrachospermum, . . 116-119 



Dudresnya, 119-126 



Collema,' . 126-128 



CHAPTER VI. ARCHEGONIATES. 



Pteridophyta, 129 



The spermatozoid, ... . 120-136 



The egg-cell and fecundation, . 136-142 



Gymnosperms, ...... j^ 2 



Cycas, Zamia, and Ginkgo, . . . 142 



The male gametophyte and the development of the sperma- 



tozoids, .... 142-155 



The archegonium, 156-158 



Fecundation, . . . 158-163 



Pinus, . ... j3 



The male and female gametophytes, . . . 163-164 



Fecundation, ...... 165-168 



CHAPTER VII. ANGIOSPERMS. 



The embryo-sac, or female gametophyte, .... 169-174 



The male gametophyte, . ... 174-176 



The fusion of male and egg-nucleus, .... 176-177 



The fate of the second male nucleus in the embryo-sac, . 177-180 



Bibliography, . . . . . . . jSi-iS 



