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Thamnobryum angustifolium
Conservation status
Critically Endangered  (IUCN 3.1)
Scientific classification
Kingdom:	Plantae
Division:	Bryophyta
Class:	Bryopsida
Subclass:	Bryidae
Order:	Hypnales
Family:	Neckeraceae
Genus:	Thamnobryum
Species:	T. angustifolium
Binomial name
Thamnobryum angustifolium (Holt) Crundw.

Thamnobryum angustifolium, the Derbyshire feathermoss, is a species of moss in the Neckeraceae family. It is endemic to Derbyshire, England, being restricted to a single SSSI, where the main colony covers about 3 square metres (32 sq ft) of a single rock face, with small subsidiary colonies nearby. Threats include disturbance from cavers and climbers, collection by bryologists, pollution of the spring in which it grows, and desiccation during periods of drought. Its natural habitat is rivers.

Because of its extreme rarity and localised occurrence, the species has its own individual Biodiversity Action Plan and is included on a list of the world's most threatened bryophytes.

The plant is similar to the common Thamnobryum alopecurum, but can be distinguished from it by the structure of the branch leaves, which are narrower, very strongly toothed, parallel-sided and have a broad nerve. The leaves of T. cataractarum are less strongly toothed but they have an even broader nerve.

References

1. ^ Hodgetts, N.; Lockhart, N.; Rothero, G.; Sergio, C. (2019). "Thamnobryum angustifolium". IUCN Red List of Threatened Species. 2019: e.T39191A87798966. doi:10.2305/IUCN.UK.2019-2.RLTS.T39191A87798966.en. Retrieved 14 November 2021.
2. Edwards, Sean R. (2012). English Names for British Bryophytes. British Bryological Society Special Volume. Vol. 5 (4th ed.). Wootton, Northampton: British Bryological Society. ISBN 978-0-9561310-2-7. ISSN 0268-8034. {{cite book}}: |journal= ignored (help)
3. Hodgketts, Nick G. (March 2001). "Thamnobryum angustifolium: Derbyshire feather-moss" (PDF). Joint Nature Conservation Committee. Archived from the original (PDF) on 10 December 2015. Retrieved 2 October 2017.

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• IUCN Red List critically endangered species
• Endemic flora of England
• Neckeraceae
• Critically endangered plants
• Environment of Derbyshire
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• Hypnales stubs