Puccinellia maritima

The common name of this one is salt marsh grass. You might easily confuse this grass with Festuca rubra (red fescue grass) but a dead givaway is that Puccinellia maritima has a ligule (a little flap of tissue between the leaf and the stem). It's not usually as bright a green colour as F. rubra and it grows lower down on the salt marsh. It has long runners which help it spread and also help stabilise the mud. It has rolled leaves to protect its stomata to help save water. Its tussocky growth provides a habitat for invertebrates and a trap for dust and silt. This species has mycorrhizal relationships (fungus on its roots) which helps it obtain extra nitrogen.