Phylum Myxornycetes
1) They are known as cellular slime moulds mostly grow in damp places e.g. soil and rotting tree trunks.
2) They have a curious life-cycle in which free living 'amoebas' aggregate into slimy multinucleate 'slug' which forms a spore producing sporangium, the spores develop into a new generation of 'amoebas'.