Kingdom Fungi: Important Characteristics It is the kingdom of multicellular or multinucleate achlorophyllous and spore-producing eukaryotic organisms like Rhizopus, rusts, mildews, mushrooms, bracket fungi, morels, etc. except yeast. The body of a fungus is called mycelium. It is made of a number of filaments called hyphae (singular-hypha). Hyphae are multicellular or multinucleate. Cells are dikaryotic