PN.EOSPORE.-E 



255 



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

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



•T-ir, 



1 



4 



h 







Fig. 230. — Padina Pavonia Gaill. «;, natural size ; b, portion of surface of thallus with tetra^poranges ; 

 c, iransver>e section of upper portion of thallus ; d, of lower portion (x 100). (After Kutzing.) 



Florideas, 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- 



Fig. 231. — Stages in the formation of the tetraspores in Padina Pavonia (magnified). (After Reinke.) 



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

 fertilisation, to retain the Dictyotaceae as an aberrant order of Pha^osporeae, 

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



