⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record tro-35142351, with some changes.

Porotrichum tenuicostatum (Hampe) Paris is a synonym of Porotrichum longirostre (Hook.) Mitt.

This name is a synonym of Porotrichum longirostre (Hook.) Mitt..

The record derives from Tropicos which reports it as a synonym (record 35142351) with original publication details: Index Bryol. 1017 1017 1898.