The Lye Valley SSSI, Headington, Oxford, is an 8,000 year-old internationally rare habitat, a tufa-forming valley-head alkaline spring fen. It represents 1.5 ha of only 19 ha of this habitat left in all England. It supports over 20 species of plant rare in Oxfordshire of which 14 are on the England Red List. It also hosts ten species of rare and 27 species of nationally scarce invertebrates, notably soldier flies and glow worms, as well as thriving populations of reptiles and amphibians.


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