microflora

noun, plural mi·cro·flo·ras, mi·cro·flo·rae [mahy-kroh-flawr-ee, –flohr-ee] /ˌmaɪ kroʊˈflɔr i, -ˈfloʊr i/. (used with a singular or plural verb)

1. Biology. microscopic plants.
2. Ecology. the flora of a microhabitat.

noun

1. the community of microorganisms, including algae, fungi, and bacteria that live in or on another living organism or in a particular habitat