⚠ Version 1 of The Plant List has been superseded.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 Orthotrichum pylaisii in version 1.1 of The Plant List.
This name is a synonym of Orthotrichum blyttii subsp. arcticum .
The record derives from Tropicos which reports it as a synonym (record 35173750
) with original publication details: Eur. N. Amer. Bryin. 2: 302 302 1897.