REPRODUCTIVE APPARATUS OF FLORIDEJE. 



349 



of which are found upon every part of our coasts, attached either 

 to rocks or stones or to larger Algae, and often themselves afford- 

 ing an attachment to Zoophytes and Bryozoa. They chiefly live in 

 deeper water than the other sea-weeds ; and their richest tints 

 are only exhibited when they grow under the shade of projecting 

 rocks or of larger dark-coloured Algae. Hence in growing them 

 artificially in Aquaria, it is requisite to protect them from an 

 excess of light ; since otherwise they become unhealthy.— The 

 nature of the fructification of the Rhodospermece (or Floridece) is 

 less perfectly understood than that of the Fucoid Alga?. It is 

 certain, however, that Antheridia exist among them ; these being 

 developed in individuals that do not produce spores, and in pretty 

 much the same situations. The products of these Antheridia, 

 however, do not exhibit the spontaneous motion of ordinary 

 antherozoids. Of the Spores there are two kinds, of which one 



Fig. 164. 



Arrangement of Tetraspores in Carpocaulon mediterraneum : 

 —a, entire plant ; b, longitudinal section of branch. (N.B. 

 Where only three tetraspores are seen, it is merely because 

 the fourth did not happen to be so placed as to be seen at the 

 same view. ) 



