See text Ptilium is a genus of mosses with very broad worldwide occurrence.

This genus is within the family Hypnaceae,[1][2] in the class Bryopsida, subclass Bryidae and order Hypnales.

Some of these species occur on the floor of Canadian boreal forests; an example of this occurrence is within the black spruce/feathermoss climax forest, often having moderately dense canopy and featuring a forest floor of feathermosses including, according to Hogan, Hylocomium splendens, Pleurozium schreberi and Ptilium crista-castrensis.

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