1992, Rudolf M[athias] Schuster,The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, Chicago, Ill.:Field Museum of Natural History,→ISBN, pages3–4:
As with the Lejeuneaceae, this pattern of massive speciation appears to be correlated with theCretaceous explosion of the angiosperms and the simultaneous creation of a host of new microenvironments, differing in humidity, light intensity, texture, etc.
