⚠ Version 1 of The Plant List has been superseded.
This name record (from Tropicos) is not included in version 1.1 of The Plant List. It is possible the same name is included from a different data source, to check this you can search for Isopterygium aquaticum in version 1.1 of The Plant List.
This name is a synonym of Isopterygium affusum .
The record derives from Tropicos which reports it as a synonym (record 35168335
) with original publication details: Bryologist 67: 453. f. 33--36 453 1964.