101 



that Actinococcus subcutanens may really be "an asexual genera- 

 tion of Phyllophora Brodiaei, growing parasitically on the sexual 

 generation." Darbishire (loc. cit.) succeeded in showing that 

 the thallus of Actinococcus subcutaneus develops from a spore 

 that enters the thallus of the male plant of Phyllophora Brodiaei 

 through an antheridial ostiole, but he was not able to discover 

 whence the spore came or whether it was a tetraspore or a carpo- 

 spore. 



Polysiphonia urceolata formosa (Suhr) J. Ag. Sterile. 



Rhodomela subfusca (Woodw.) Ag. Tetrasporic. 



Ceramium rubrum (Huds.) Ag. Tetrasporic. 



Rhododermis Georgii (Batt.) Collins. Forming cushions on the 

 margins of Zostera leaves, with sporangia. 



Corallina officinalis L. 



On March 7, Pylaiella littoralis (L.) Kjellm., Polysiphonia 

 nigrescens (Dillw.) Grev., and Epilithon membranaceum (Esp.) 

 Heyd. were added to the foregoing lists. 

 New York Botanical Garden. 



