82 



THE ALGAE 



usually barrel-shaped, and in some species, e.g. C. darwinii, are so 

 large they can be seen by the naked eye. Reproduction can take 

 place from all cells except the basal one and is by means of zoo- 

 spores or gametes. In some species alternation of generations has 

 been demonstrated and it probably occurs in most. The species 

 occur in rock-pools and attached to rocks along the sea-shore. 



400 p. 



Fig. 43 Left to right : Rama antarctica, Lola implexa, Chaetomorpha 



aerea. 



Cladophoraceae : Lola (a thread). Fig. 43 



This genus comprises fine, hair-like, unbranched filaments, 

 usually free-Hving, that formerly were included in the genera 

 Chaetomorpha and Rhizoclonium. The number of nuclei per cell 

 are fewer than in the former genus (5-20), and the small rhizoidal 

 branches of the latter genus are lacking. Most of the species occur 

 on salt marsh muds. 



Cladophoraceae: Rama (a branch). Fig. 43 



The species of this genus, mostly South Pacific, possess a few 

 true branches such as are found in Cladophora (see below), but they 



