MYCETOZOA 299 



Each of these cells moves outward at right angles to the surface, 

 still enveloped by the thin hyaline layer, which forms a stalk 

 below. These cells are spores, which become ellipsoid and covered 

 by a membrane when fully formed. The spore is uninucleate at 

 first, but soon becomes tetranucleate. When a spore reaches the 

 water, its contents emerge as an amoebula which divides three 

 times, forming 8 small bodies, each of which develops a flagellum 

 and becomes a myxofiagellate. The remaining part of the de- 

 velopment is presumably similar to that of the endosporous form. 

 An enormous number of mycetozoan genera are known. The 

 order is divided here into two suborders according to Lister. 



Spore develops into myxoflag^ellate; myxamoebae fuse completely and 

 form Plasmodium Suborder 1 Euplasmodia 



No flagellate stage; myxamoebae grouped prior to spore-formation, 



but do not fuse to form a true Plasmodium 



Suborder 2 Sorophora (p. 302) 



Suborder 1 Euplasmodia Lister 



Spores develop within sporangia Tribe 1 Endosporeae 



Spores violet or violet-brown Legion 1 Amaurosporales 



Sporangia with lime Sublegion 1 Calcarinea 



Lime in small granular form Family 1 Physaridae 



Genus Badhamia Berkeley (Fig. 136, a, b) 

 Capillitium, a coarse network with lime throughout. 



Genus Fuligo Haller (Fig. 136, c, d) 



Capillitium, a delicate network of threads with vesicular ex- 

 pansions filled with granules of lime. 



Lime in crystalline form Family 2 Didymiidae 



Genus Didymium Schrader (Fig. 136, e, f) 

 Lime crystals stellate, distributed over the wall of sporangium. 



Sporangia without lime Sublegion 2 Amaurochaetinea 



Sporangia stalked Family 1 Stemonitidae 



Genus Stemonitis Gleditsch (Fig. 136, g, h) 



Sporangium-wall evanescent; capillitium arising from all parts 

 of columella to form a network. 



Sporangium combined into aethalium 



Familv 2 Amaurochaetidae 



