Nearly worldwide, except Australia, Oceania, and Antarctica, temperate and tropical regions.
Genera 7, species ca. 40 (3 genera, 6 species in the flora).
Leucodontaceae have been circumscribed variously in recent years, with the broad concept of M. G. Manuel (1974) modified by recent phylogenetic reappraisals (W. R. Buck and B. Goffinet 2000) of the taxonomic position of Alsia and Forsstroemia (in Leptodontaceae), Bestia (in Lembophyllaceae), Dendroalsia (in Cryphaeaceae), and Pseudocryphaea (in Rutenbergiaceae). The main traits of Leucodontaceae are the epiphytic habit, sympodial stems with curved, ascending secondary branches, ovate to ovate-lanceolate leaves, costa usually absent or short and double, laminal cells ovate or elliptic, thick-walled, seldom papillose, and endostome commonly reduced.
|1||Costae subpercurrent, with 2 or more shorter costae at base.||Antitrichia|
|1||Ecostate or costae double, short||> 2|
|2||Leaf margins entire distally; laminal cells smooth or rarely slightly papillose distally over cell lumina; ecostate.||Leucodon|
|2||Leaf margins serrate distally; laminal cells prorate, especially distally; ecostate or costae double.||Nogopterium|