Genus of about 700 species of evergreen or semi-evergreen, terrestrial or epiphytic ferns found on all continents except Antarctica. The Aspleniums or Spleenworts need shade and a moist atmosphere. There are 2 basic types which are cultivated as house plants. Firstly there is the Bird's Nest Fern - Asplenium nidus. Bird's Nest Fern is moderately easy to grow and tolerates low light situations.