Ptilium crista-castrensis (Hedw.) De Not.
Knights plume moss, ostrich-plume feathermoss
[An article has not been written yet.]
Hypnum crista-castrensis Hedw.
11/21/2023 · Merritt Mountain, Phippsburg, Maine 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| Division | Bryophyta | Mosses |
| Subdivision | Musci | Mosses (all 12,000 of them) |
| Class | Bryopsida | Mosses with arthrodontous spore capsules, which is most of them |
| Subclass | Bryidae | Mosses with a double peristome with alternating tooth segments |
| Order | Hypnales | An order of Bryophyta or leafy mosses |
| Family | Hypnaceae | From New Latin Hypnum, the type genus, and -aceae |
| Genus | Ptilium | From Greek πτίλον (ptilon), ”a feather“—for the featherlike plumes of the moss |
| Species | crista-castrensis | From crista, ”crest,“ castrum, ”military camp,“ and -ensis: relating to a military camp, suggesting soldiers with feathery plumes |
Ptilium crista-castrensis description by Thomas H. Kent, not updated.
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