Worldwide, mostly tropics.
Genus 1, species 450 (37 in the flora).
Fissidentaceae is recognized easily by its distichous and equitant leaves. This leaf form is closest to that of Bryoxiphium. The hepatic Diplophyllum is often confused with Fissidens. Relationship of the Fissidentaceae is with the Dicranaceae; both families have similar peristomes but differ principally in leaf structure.