PHJEOSPOREM 



255 



observed. As the Cutleriaceae present an approach towards the Fucaceae, 

 so the Dictyotaces may possibly indicate the point of departure of the 



^ t *♦ < 1 * 





Fig. 230. — Padina. Pavonia.Q>2^S\.. a, natural size ; i, portion of surface of thallus with tetrasporanges : 

 t:, transverse section of upper portion of thallus ; d^ of lower portion ( x 100). (After Kiitzing.) 



Florideae, agreeing with that order in the presence of tetraspores and of 

 non-motile pollinoids ; but as the oogone presents no indication of even a 

 rudimentary trichogyne, and there is no process analogous to the forma- 



FlG. 231.— Stages in the formation of the tetraspores mPadina.Pa.voma (magnified). (After Reinke.) 



tion of a cystocarp, it seems best, until more is known of the process of 

 fertilisation, to retain the Dictyotaceee as an aberrant order of Phaeosporeas, 

 with which they also agree best in the nature of their pigment. 



