knight's plume moss
Ptilium crista-castrensis (Hedw.) De Not.

Ptilium crista-castrensis is a moss species in the family Pylaisiaceae. It is commonly known as knight's plume moss and is found in regions including Labrador, Québec, Flanders, Vermont, and parts of Europe. The species was first described in 1867.
Description
Ptilium crista-castrensis, also referred to as knight's plume moss, is a member of the Pylaisiaceae family. It is distributed across several regions such as Labrador, Québec, Flanders, Vermont, and parts of Europe including the Grand Duchy of Luxembourg and Denmark. This moss is part of the genus Ptilium and was formally described in 1867. It belongs to the order Hypnales within the class Bryopsida.
Other common names
knight's plume mossKnights Plume MossOstrich-Plume Feather-MossOstrich-Plume Moss
Distribution
Labrador · Québec · TW · Flanders · SE · Vermont-US · NO · DK · Grand Duchy of Luxembourg · Belgium · Flemish Region
Synonyms
Hypnum crista-castrensisHypnum crista-castrensis var. gracilescensHypnum crista-castrensis var. pseudomolluscumPtilium crista-castrensis var. pseudomolluscumCtenium crista-castrensisStereodon crista-castrensisPtilium crista-castrensis f. gracilescensHypnum cristiformeHypnum hedwigiiHypnum scalarePtilium crista-castrensis f. adpressumHypnum crista-castrensis var. adpressumHypnum crista-castrensis var. elongatum