The Myxomycetes of the Miami Valley, Ohio. 161 



n. Capillitium of short free elaters. 18, 19. 



Capillitium of long slender attached tubules. 16, 17. 



0. Tubules of the capillitium forming a complicated net- 



work, (p.) 



Tubules of the capillitium forming no evident net- 

 work, (q.) 



p. Capillitium proceeding from numerous points of the 

 sporangial wall, 13. 

 Capillitium issuing from the interior of the stipe, 14, 15. 

 q. Wall of the sporangium with an outer layer of minute 

 scales and granules, 11, 12. 

 Wall of the sporangium not thickened, 10. 

 r. Wall of the sporangium a thin membrane with distinct 

 fibrous thickenings, which form a network, 7, 8. 

 Wall of the sporangium a thin membrane, often granu- 

 lose-thickened (s). 

 s. Sporangia sessile, 1. 2. 

 Sporangia stipitate, 3. 



MYXOMYCETES. 



81. PERITRICHLE. 



Sporangium destitute of lime and the stipe never prolonged 

 into a columella. Capillitium more or less rudimentary, 

 connate with the inner surface of the wall of the sporangium. 



1. IvICEACEiE. Wall of the sporangium a thin mem- 

 brane, often granulose-thickened. 



a. Sporangia sessile. 



1. IviCKA. Sporangia simple and regular or plasmodio- 

 carp, gregarious ; hypothallus none. 



2. Tubuuna, Sporangia cylindric, distinct or more or 

 less connate and sethalioid, seated upon a common hypo- 

 thallus. 



b. Sporangia stipitate. 



3. OrcadklIvA. Sporangium urn-shaped, opening by a 

 deciduous lid. 



15 



