A survey of the diversity and ecology of Namibian fungi was initiated in 1991 and is presently ongoing. This paper is a discussion of fungal ecology, utilizing the fungi collected to date in the Etosha National Park as examples. The majority of macro-fungi collected in a single sampling of the Okaukuejo region following rains were decomposers of various substrates: fallen Colophospermum mopane twigs, leaves and branches; buried grass detritus; zebra, horse and elephant dung. Keyword: Asexual microscopic spores, Biotic, Decomposers, Extra-cellular enzymes, Fungal biodiversity, Fungus-termite mutualism, Ground biota, Hyphal cells, Macrotermes species, Nutrient cycling, Spore inoculum, Vegetative mycelial growth, Vesicular arbuscular mycorrhizae and Woody substrates.