| Noun | 1. | genus Asplenium - in some classification systems placed in family Polypodiaceaefern genus - genera of ferns and fern allies Aspleniaceae, family Aspleniaceae - one of a number of families into which Polypodiaceae has been subdivided in some classification systems; includes genera Asplenium, Pleurosorus, Schaffneria spleenwort - any of various chiefly rock-inhabiting ferns of the genus Asplenium Asplenium nidus, bird's nest fern - tropical Old World or Australian epiphytic fern frequently forming tufts in tree crotches Asplenium scolopendrium, Phyllitis scolopendrium, hart's-tongue, hart's-tongue fern - Eurasian fern with simple lanceolate fronds Asplenium ceterach, Ceterach officinarum, scale fern, scaly fern - small European fern with chaffy leathery fronds |