COUNTRYSIDE COUNCIL FOR WALES
SITE OF SPECIAL SCIENTIFIC INTEREST: CITATION
ANGLESEY CORS BODEILIO
National Grid Reference: SH500775
Area: 54 ha
Cors Bodeilio is a nationally important calcareous mire situated in a shallow valley between Pentraeth and Llangefni. The mire is supplied with base-rich water from the surrounding Carboniferous Limestone which has promoted the development of a range of rich-fen vegetation communities that now overlie a body of fen peat.
The structure of the vegetation varies in different sections of the valley mire and fen species including mainly great fen-sedge Cladium mariscus, black-bog rush Schoenus nigricans, blunt-flowered rush Juncus subnodulosus, common reed Phragmites communis, sweet gale Myrica gale and purple moor grass Molinia caerulea are dominant or co-dominant over large areas. Other sedge communities also occur and in places characteristic fen bryophyte carpets are well-developed. A notable feature of Cors Bodeilio is its rich orchid flora which includes the uncommon narrow-leaved marsh orchid Dactylorchis traunsteineri and fly orchid Ophrys insectifera growing here in Schoenus communities. The fen also supports a diverse invertebrate fauna with a variety of rare and uncommon species; it is particularly rich in Diptera (true flies), aquatic Coleoptera (beetles) and Lepidoptera (moths).
CCW manages part of this site as a National Nature Reserve.