A survey of various species of slime moulds on their natural substrates. Plasmodial movement, food uptake and behaviour, fruit body and sclerotium formation in situ (Physarium, Stemonitis, Arcyria, Badhamia), exospore formation (Ceratiomyxa), various fruit bodies and their methods of spore dissemination (Dianema, Metatrichia, Trichia, Arcyria, Stemonitis, Lycogala); cellular development process (Didymium). With time-lapse.