The Myxo)>iycetcs of the J\fia)ni Valley, Ohio. 127 



THE MYXOMYCETES OF THE MIAMI VALLEY, 



OHIO. 



By a. p. Morgan. 



Third Paper. 

 (Read February 6, 1S94.) 



Order VI. STEMONITACE^. 



Sporangia globose or ovoid to oblong and cylin- 

 drical, stipitate; the wall very thin and fragile, soon 

 disappearing. Stipe tapering upward and continued 

 within the sporangium as a more or less elongated 

 columella. Capillitium of slender brown threads, 

 arising from numerous points of the columella, 

 repeatedl}' branching and usually anastomosing to 

 form a network, persistent and rigidly preserving 

 the outline of the sporangium. Spores globose, 

 brown or violaceous. 



This order is readily distinguished by the brown persistent 

 capillitium, arising from a lengthened columella, and rigidly 

 maintaining the form of the sporangium. 



Table of Genera of Stemgnitace.-e. 



A. Stipe and columella brazen or black. 



a. The columella scarcely reachhig the center of the 

 sporangium. 



I. Clastoderma. Threads of the capillitium forking sev- 

 eral times, but not combined into a network. 



