MYCETOZOA 339 



Genus Didymium Schrader (Fig. 157, e, f) 



Lime crystals stellate, distributed over the wall of sporangium. 

 Sporangia without lime 



Sporangia stalked Family 3 Stemonitidae 



Genus Stemonitis Gleditsch (Fig. 157, g, h) 



Sporangium-wall evanescent; capillitium arising from all parts of 

 columella to form a network. 



Sporangium combined into aethalium 



Family 4 Amaurochaetidae 



Fig. 158. a, b, Amaurochaete fuliginosa MacBride (a, group of spor- 

 angia, X|; b, capillitium, XlO) (Lister); c, empty sporangium of Cri- 

 braria aurantiaca Schrader, X20 (Lister); d, sporangium of Orcadella 

 operculata Wingate, X80 (Lister); e, cluster of sporangia of Tubulina 

 jragiformis Persoon, X3 (Lister); f, aethalium of Reticularia lycoperdon 

 Bull., XI (Lister); g, aethalium of Lycogala miniatum Persoon Xl (Lis- 

 ter); h-j, Trichia affinis de Bary (h, group of sporangia, X2; i, elater, 

 X250; j, spore, X400) (Lister); k, 1, Arcyria punicea Persoon (k, four 

 sporangia, X2; 1, part of capillitium, X250 and a spore, X560) (Lister); 

 m, n, Ceratiomyxa fruticulosa MacBride (m, sporophore, X40; n, part of 

 mature sporophore, showing two spores, X480) (Lister). 



Genus Amaurochaete Rostafinski (Fig. 158, a, b) 



With irregularly branching thread-like capillitium. 

 Spores variously colored, except violet 



Capillitium absent or not forming a system of uniform threads. 



Sporangium-wall membranous; with minute round granules 



Family 5 Cribrariidae 



