| Noun | 1. | Microsorium - tropical usually epiphytic ferns; Africa to Asia and Polynesia to Australiafern genus - genera of ferns and fern allies family Polypodiaceae, Polypodiaceae - ferns: a large family that in some classification systems has been subdivided into several families (including Aspleniaceae and Blechnaceae and Davalliaceae and Dennstaedtiaceae and Dryopteridaceae and Oleandraceae and Pteridaceae) climbing bird's nest fern, Microsorium punctatum - tropical Africa to Australasia and Polynesia |