The SM spores of Didymium have 'cracked open' (germinated) on water agar to give rise to amoebae (myxamoebae). The brown PacMan-like structures are the spores walls. The 'fried egg' in the middle of each amoeba is the haploid nucleus. Eventually two amoebae of compatible types, and hopefully from different genetic pools, will fuse to produce an amoeba with a diploid nucleus. This diploid 'thallus' will grow to become the mutinucleate plasmodium. Meiosis (reduction division),to get back to the haploid state with appropriate recombination of genetic material, takes place in the developing fruitbody.
amoebae of SM are animal like
slime moulds feed by phagocytosis (ingestion by engulfing) = animal-like
spores of SM are fungus-like
fruitbodies of SM are fungus-like
walls of spores in SM are cellulose (plant-like)
walls in fungi are chitin, and chitosan etc
plasmodium in slime moulds has DIPLOID nuclei (plant or animal like)
plasmodium moves and feeds like a giant amoeba
hyphae of fungi contain HAPLOID nuclei
So! Are slime moulds animals, plants, fungi, or what?