Fruit Beetle Millipedes Mites Redworms Sowbugs Springtails Fungi Fungi is the name for a family of simple organisms that lack a photosynthetic pigment which includes molds and yeasts. Next to Bacteria , fungi are one the most efficient decomposer organisms. They spread and grow vigorously by producing many cells and filaments, and they can attack organic residues that are too dry, acidic, or low in nitrogen for bacterial decomposition. Fungal species are numerous during both mesophilic and thermophilic phases of composting.
Most fungi live in the outer layer of compost when temperatures are high.
Compost molds can grow both as unseen filaments and as gray or white fuzzy colonies on the compost surface.