⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record tro-35144020, with some changes.

Pterygophyllum undatum (Hedw.) Brid. is a synonym of Thamniopsis undata (Hedw.) W.R. Buck

This name is a synonym of Thamniopsis undata (Hedw.) W.R. Buck.

The record derives from Tropicos which reports it as a synonym (record 35144020) with original publication details: Muscol. Recent. Suppl. 4: 149 149 1819.