2 Cincinnati Society of Natural History. 



Tabi,e of Genera of Physarace^E. 



I. Tubules of the capillitium having the granules of lime 

 in them aggregated into roundish or angular nodules, with 

 intervening empty spaces. 



A. Outer surface of the spora7igium destitute of lime. 



1. Angioridium. Plasmodiocarp laterally compressed, 

 splitting regularly into two valves. 



2. Cienkowskia. Plasmodiocarp terete, elongated, irregu- 

 larly dehiscent. 



3. Leocarpus. Sporangia subglobose or obovoid, stipitate 

 or sessile. 



B. Outer surface of the sporangmm invested with granules 



of lime. 



a. Stipe prolo7iged within the sporangium as a columella. 



4. Physarei<IvA. Sporangium oblong, stipitate, the apex 

 re-entrant. 



5. Cytidium. Sporangium globose, stipitate, the apex 

 convex. 



b. Stipe never entering the sporangium. 



6. Craterium. Sporangium obovoid to cylindric, stipitate. 



7. Physarum. Sporangium globose, depressed globose or 

 irregular, stipitate or sessile. 



8. Fuugo. Aethalium a compound plasmodiocarp. 



II. Tubules of the capillitium with the granules of lime in 

 them distributed throughout their entire length. 



9. Badhamia. Stipe not prolonged within the sporangium 

 as a columella. 



10. Scyphium. Stipe entering the sporangium and pro- 

 longed within it as a columella. 



2 



