166 Cincinnati Society of Natural History. 



IX. PHYSARACEAE. Wall of the sporangium a thin 

 membrane, usually with an outer layer of minute roundish 

 granules of lime ; capillitium of slender tubules, which 

 branch repeatedly and form an intricate network ; the tubules 

 expanded at the angles of the network and inclosing gran- 

 ules of lime. 



I. Tubules of the capillitium having the gra?iules of lime in 

 them aggregated into roundish or angular ?iodules. 



A. Outer surface of the sporangium destitute of lime. 



30. Angioridium. Plasmodiocarp laterally compressed, 

 splitting regularly into two valves. 



31. Ciknkowskia. Plasmodiocarp terete, elongated, ir- 

 regularly dehiscent. 



32. Lkocarpus. Sporangia subglobose, or obovoid, stipi- 

 tate or sessile. 



B. Outer surface of the sporangium invested with granules 

 of lime. 



a. Stipe prolo?iged within the sporangium as a columella. 



33. PhysareIvLA. Sporangium oblong, stipitate, the apex 

 re-entrant. 



34. Cytidium. Sporangium globose, stipitate, apex 

 convex. 



b. Stipe never entering the sporangium. 



35. Craterium. Sporangia obovoid to cylindric, stipitate. 



36. Physarum. Sporangia globose, depressed globose or 

 irregular, stipitate or sessile. 



37. Fueigo. Aethalium a compound plasmodiocarp. 



II. Tubules of the capillitium with the gra?iules of lime in 

 them distributed throughout their entire length. 



38. Badhamia. Stipe not prolonged within the sporan- 

 gium as a columella. 



39. Scyphium. Stipe entering the sporangium and pro- 

 longed within it as a columella. 



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