Black Spleenwort (Asplenium adiantum-nigrum) is a widespread fern in Monmouthshire. In the Flora of Monmouthshire author Trevor Evans refers to the population growing between the stonework of Hill Pits chimney at Garn yr erw near Blaenavon as the highest known location in the vice county. Also notable of late is a Common Whitlowgrass (Eruphila verna). This early flowering plant was recorded recently growing between pavement slabs in Magor and Caldicot town centres. Probably under recorded.
Dunlop Semtex Pond has largely been de-watered for engineering works exposing a margin of smelly mud and assorted urban clutter hoisted in by environmentally friendly locals. However de-watering exercises can provide opportunities for biological recording. In among the debris are many hundreds of dead Horny orb mussel (Sphaerium corneum).