"Confusionabout the true identity of Leskea rotulata/Hypopterygium rotulatum) arose already rather early in history. Wilson (1855) was presumably the first who was aware of this problem. The material examined for the present study that was presented as Leskea rotulata, or Hypopterygium rotulatum, proved in majority to belong to two distinct, separate taxa (Hypopterygium didictyon and Hypopterygium tamarisci)."
Kruijer (2002) - Hypopterygiaceae of the World