Ptilium crista-castrensis
| Ptilium crista-castrensis | |
|---|---|
| P. crista-castrensis in Finland | |
| Scientific classification | |
| Kingdom: | Plantae |
| Division: | Bryophyta |
| Class: | Bryopsida |
| Subclass: | Bryidae |
| Order: | Hypnales |
| Family: | Pylaisiaceae |
| Genus: | Ptilium |
| Species: | P. crista-castrensis |
| Binomial name | |
| Ptilium crista-castrensis (Hedw.) De Not. | |
Ptilium crista-castrensis, the knights plume moss or ostrich-plume feathermoss, is a moss species within the family Pylaisiaceae, in the class Bryopsida, subclass Bryidae and order Hypnales.