⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record tro-35107403, with some changes.

Phascum tetragonum Hook. is a synonym of Tetrapterum tetragonum (Hook.) A.L. Andrews

The record derives from Tropicos which reports it as a synonym (record 35107403) with original publication details: Bot. Misc. 1: 124. 31 124 1829.