|Scientific Name:||Thamnobryum angustifolium (Holt) Crundw.|
Thamnium angustifolium Holt.
|Taxonomic Source(s):||Hodgetts, N.G. and Blockeel, T.L. 1992. Thamnobryum cataractarum, a new species from Yorkshire, with observation on T. angustifolium and T. fernandesii. Journal of Bryology 17: 251–262.|
|Red List Category & Criteria:||Critically Endangered B1+2c ver 2.3|
|Assessor(s):||Bryophyte Specialist Group|
|Reviewer(s):||Hallingbäck, T., Hodgetts, N., Geissler, P. & Tan, B. (Bryophyte Red List Authority)|
The known area of occupancy is less than 10 km² and the species is subject to a number of threats and potential threats. The number of old herbarium specimens clearly shows that it has declined. It therefore meets the IUCN criteria for Critically Endangered based on the small area, the only locality and the decline.
|Range Description:||Only one locality in Derbyshire, England.|
Native:United Kingdom (Great Britain)
|Range Map:||Click here to open the map viewer and explore range.|
|Current Population Trend:||Unknown|
|Habitat and Ecology:||Shaded cliff beside a calcareous spring or on limestone in a stream.|
|Major Threat(s):||This species is sensitive to disturbance from a possible new footpath, rock-climbers and cavers, collection by bryologists. Any pollution of the spring in which it grows may also threaten it. Possibly the greatest threat is desiccation caused by extensive periods of drought when the spring does not flow.|
|Conservation Actions:||The only locality is in a nature reserve.|
|Citation:||Bryophyte Specialist Group. 2000. Thamnobryum angustifolium. The IUCN Red List of Threatened Species 2000: e.T39191A10168629.Downloaded on 24 February 2018.|
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