196 



Transactions. 



o. 



Figs. 2-5. — L. Billardieri. Central body of mature prothalli in general view, 

 complete except for basal cone, with old and also yomig branches, 

 bearing sexual organs and paraphyses. Figs. 2, 3, and 5, X 25 ; 

 fig. 4, X 10. 



Fig. 3a. — L. Billardieri. Old antheridium in surface view. 



