CARPOPHTTA. 



169 



filaments, which are arranged radially; the diameter of 

 each cushion-like mass is from 1 to 3 mm. (.04 to .08 in.) 

 or less. 



300. Asexual reproduction is by means of ciliated zoo- 

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

 through a round hole in the cell- wall (D, Pig. 93). 



301. 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. 92). In the swollen basal portion there 



Fig. 92.— Coleoohaste. an, antherids ; og, carpogones, each with a trich- 

 ogyne; z, z, antherozoids ; B, fertilized carpogone, surrounded by the 

 covering, r ("pericarp"), the whole forming the spore-fruit; C, spore- 

 fruits burst open, showing interior tissues ; D, zoospores from C. Magni- 

 fied 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, z, Fig. 92). 



