326 A TEXTBOOK OF GENERAL BOTANY 
The fertilized egg then surrounds itself with a thick wall and 
becomes a resting spore. This spore is known as an odspore, as 

Fic. 833. Oedogonium 
The first figure represents the escape of spermatozoids; the next four, ferti- 
lization ; the sixth figure, odspore ; the seventh to ninth figures, escape of contents 
of odspore ; the last two figures, formation of zoospores. (The first figure re- 
drawn after Hirn ; the remainder redrawn after J uranyi) 
it is produced by the fertilization of an egg. When it germinates, 
the protoplasm divides to form four zodspores (Fig. 333). 
In some species the antheridia occur in ordinary vegetative 
filaments (Fig. 331); in other species they oceur in dwarf male 
