⚠ Version 1 of The Plant List has been superseded.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 Ptychomitrium longisetum in version 1.1 of The Plant List.
This name is a synonym of Ptychomitrium gardneri var. angustifolium .
The record derives from Tropicos which reports it as a synonym (record 35144138
) with original publication details: J. Hattori Bot. Lab. 12: 24. f. 14: 16--17 24 1954.