COUNTRYSIDE COUNCIL FOR WALES
SITE OF SPECIAL SCIENTIFIC INTEREST: CITATION
ANGLESEY TYDDYN Y WAEN
National Grid Reference: SH469843
Site Area: 8.9 ha
This site is selected for its biological interest, in particular as an example of fen meadow habitat with associated soligenous mire.
There is a range of different vegetation communities within a small area at Tyddyn y Waen SSSI reflecting ecological gradients and a variable management history. Where there has been regular livestock grazing fen meadow vegetation dominated by Sharp-flowered Rush Juncus acutiflorus and Blunt-flowered Rush Juncus subnodulosus with a variety of associated forbs, including the locally uncommon Fen Bedstraw Galium uliginosum, are present. Elsewhere, there are both acidic and base-rich flushes; in the former species such as Purple Moor-grass Molinia caerulea and Bog Asphodel Narthecium ossifragum occur, while in the latter Black Bog-rush Schoenus nigricans is locally abundant and the vegetation is more species-rich with a number of infrequent plants, e.g. Broad-leaved Cottongrass Eriophorum latifolium and the liverwort Leiocolea bantriensis. There are also large stands of Great Horsetail Equisetum telmateia and Lesser Pond-sedge Carex acutiformis. In an unmanaged area there is a willow thicket dominated by Grey Willow Salix cinerea.