101 



that Actinococciis suhcutaneiis 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 suhcutaneus 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 iirceolata formosa (Suhr) J. Ag. Sterile. 



Rhodomela suhfusca (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 memhranaceum (Esp.) 

 Heyd. were added to the foregoing lists. 

 New York Botanical Garden. 



OCCURRENCE OF THE INDIAN PIPE (MONOTROPA. 

 UNIFLORA) IN A XEROPHYTIC HABITAT 



By Edwin D. Hull 



The Indian pipe {Monotropa uniflora) is considered one of the" 

 most mesophytic of our plants, and the habitat in which it grows- 

 is supposed to conform to its nature. The 7th edition of Gray's 

 Manual gives the habitat of this species as, "Rich and dark 

 woods." S. Coulter (i) says, "Indicative of rich soil." I have, 

 however, found it growing sparingly on the oak dunes about 

 Lake Michigan at Miller, Lake Co., Indiana, where it seems to 

 be the only mesophyte in an otherwise distinctly xerophytic 

 flora, at least so far as the vascular plants are concerned. The 

 trees of this association, of which the black oak (Quercus velutina) 

 far exceeds all the other species in abundance, stand some dis- 

 tance apart and permit considerable light to penetrate, so that 

 the forest is decidedly open rather than dark. The undergrowth 

 does not form a continuous mat, and there are numerous broad 



