COUNTRYSIDE COUNCIL FOR WALES
SITE OF SPECIAL SCIENTIFIC INTEREST: CITATION
ANGLESEY LLYN HAFODOL & CORS CLEGYROG
National Grid Reference: SH394890 & SH386891
Site Area: 30.7 ha
This site comprises two wetland basins situated very near to one another in north Anglesey; they are of biological interest, principally as examples of lowland mire habitat types.
Cors Clegyrog is an acidic basin mire with a mosaic of different vegetation types. Over much of the peat-filled basin there are communities in which purple moor-grass Molinia caerulea, cottongrass Eriophorum angustifolium, heather Calluna vulgaris and bogmosses Sphagnum spp are locally abundant; acidic fen vegetation with species such as bottle sedge Carex rostrata is also present and there are stands of damp grassland in peripheral areas.
At Llyn Hafodol mesotrophic mire or poor fen vegetatation is particularly well-represented and characterised by the presence of species such as water horsetail Equisetum fluviatile, bog-bean Menyanthes trifoliata, marsh cinquefoil Potentilla palustris and bottle sedge Carex rostrata with a wide range of associated species including the uncommon greater spearwort Ranunculus lingua. There is also a small area of open water where the nationally rare waterwort Elatine hydropiper grows in the muddy shallows.