⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record tro-35118177, with some changes.

Hypnum longissimum Raddi is a synonym of Spiridentopsis longissima (Raddi) Broth.

The record derives from Tropicos which reports it as a synonym (record 35118177) with original publication details: Critt. Bras. 9 9 1822.