Evidently stress had to be a factor in this fuiting, note the deformity of the sporocarp. How it came about is anyones guess, they are kept in culture chambers in the dark and in a secure place.
Cellular slime molds do not necessarily have a plasmodium but what is called a pseudoplasmodium or a grex. Aggregation of the cells, the myxamoebae is brought about by the introduction, or release of a second messenger molecule cAMP (cyclic Adenosine monophosphate) acting as a signal transducer bringing the cells together or aggregation thus forming the fruiting body. I suspect that is what this last image is all about, though I may or might just be wrong but we won't go there for now.
It hints as a plasmodium but lacks the fanning pseudopods seen in the Myxogastria. All images were captured utilizing an OMANO OM2300S-V3 dissecting microscope and an out of production Sony DSC-W5 which as been a work horse of a little 5 mega pixel camera. 
