150 BOTANT. 



308. Asexual reproduction is bjr means of ciliated zoo- 

 spores, one of which may form in each cell and escape 

 through a round hole in the cell-wall (Z>, Fig. 14). 



309. In the sexual process the female organ, the carpo- 

 gone, is a single cell, wide below and tapering above into 

 a long slender canal, the trichogyne, which is open at its 

 apex (A, og. Fig. 74). In the swollen basal portion there 



Fig. 74. — ColeochsBte. an, antherids; og. carpogones, each with a trichopryne; 

 z, z, antherozoids; B, fertilized carpoeone, surrounded by the covering, rC'peri- 

 carp")' the whole forming the spore-fruit; C spore-fruits burst open, snowing 

 interior tissue; D, zoospores from C. Magnified 350 times. 



is a considerable mass of protoplasm, which is the essential 

 part to be fertilized. The male organs, the antherids, are 

 formed as flask-shaped protuberances which grow out of 

 adjoining cells. In each antherid a single oval biciliate 

 antherozoid is formed {A, z, e, Fig. 74). 



310. Fertilization is doubtless effected by these anthero- 

 zoids coming in contact with the protoplasm of the carpo- 



