Ptychostomum knowltonii

Ptychostomum knowltonii is a species of moss belonging to the family Bryaceae.^[1] Its green leaves are ovate and strongly concave.^[2]

Ptychostomum knowltonii
Scientific classification
Kingdom:	Plantae
Division:	Bryophyta
Class:	Bryopsida
Subclass:	Bryidae
Order:	Bryales
Family:	Bryaceae
Genus:	Ptychostomum
Subgenus:	Ptychostomum subg. Cladodium
Species:	P. knowltonii
Binomial name
Ptychostomum knowltonii (Barnes) J.R.Spence, 2005
Synonyms[1]
Bryum knowltonii Barnes, 1889

It is native to Northern Hemisphere.^[1]