74 



PLANT MORPHOLOGY 



Fig. CO. Dictyota dichotoma. Cros.s section of thallus with a sporangium, showing three 

 of the four spores. (After Mottier, Textbook of Botany, The Blakiston Company.) 



B 



Fig. 61. Sex organs of Dictyota dichotoma. A, cross section of thallus with group of 

 antheridia; B, cross section of thallus with group of oogonia. {After Mottier, Textbook of 

 Botany, The Blakistori Company.) 



