CHLOROPHYCE^E 135 



the older parts. The chromatophores are oval, 

 and in some species contain a pyrenoid, in others 

 not. 



The Reproductive Organs. In Bryopsis the gametes 

 are produced on different plants within the lateral 

 leaves, which undergo no modification to this end 

 beyond the separation by a cross- wall or stopper from 

 the stalk. They are of two sorts ; the smaller male 

 gametes being elongate and orange-coloured except 

 at the anterior end, the female much larger and 

 green, with a red spot between the green contents 

 and the colourless portion. They are both biciliate. 

 Sometimes the female gametes have a spike-like 

 projection from the posterior end. In C i odium the 

 gametes are borne in lateral ovate sporangia (game- 

 tangia) arising from the club-shaped pallisade cells 

 and lying among them, but never projecting beyond 

 them (Fig. 35&). They are separated at the base 

 by a cross-wall or stopper. The gametes are here 

 also of two sorts, large green ones (female) and 

 smaller yellow ones (male), both biciliate. 



Conjugation has not been observed in either 

 genus, but is extremely probable from the fact that 

 Berthold's experiments in cultivating the green 

 gametes were never successful, unless when these 

 were mixed with the smaller ones. Analogy points 

 also to this interpretation of their character. If this 

 be so, we possess in the Codiacece a valuable link 

 between Vaucheriacece and the other multinucleate 

 orders. Codiacece would thus occupy to Vaucheriacece 

 much the same position as Cutleriacece to Fucacece 

 among the olive-brown seaweeds. As for non-sexual 



