200 



REPRODUCTION OF THE RED ALGAE 



can be pointed out. Singularly the spores and gametes have 

 lost their motility. Asexual reproduction is extensively brought 

 about by spores that are usually formed in fours from a mother 



Fig. 126. A branching filament of Callithamnion, showing the spore 

 mother cells forming tetraspores. 



cell (Fig. 126) and therefore called tetraspores. These spore- 

 forming mother "cells arise singly on the surface or in the tissues 

 of the plant, or they may be associated in conspicuous groups. 



Fig. 127. Sexual reproduction in Nemalion: A, tip of branch bearing 

 female gametangium, c, and cluster of male gametangia, an, from some of 

 which the motionless male gametes are escaping. B, first division of the 

 germinating gametospore, g. C, later stage showing the early formation 

 of the branches from which the spores will be developed. D, spores forming 

 at the ends of the numerous branches. 



