⚠ Version 1 of The Plant List has been superseded.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 Bryum arnellii in version 1.1 of The Plant List.
This name is a synonym of Bryum knowltonii .
The record derives from Tropicos which reports it as a synonym (record 35116454
) with original publication details: Rev. Bryol. 28: 52 52 1901.