Colobanthus muscoides Hook.f.

Family: Caryophyllaceae

Description: Plant forming deep cushions up to many cm. across; branches many, us. close, lfy throughout their length, which may reach 5 cm. or more. Adventitious rootsamongst old leaf-bases, binding lower parts of cushion into peat-forming mass. Lvs fleshy, closely s

Habitat: common in coastal areas, where it forms extensive mats in bog communities and grows as cushions on peat, rock and sand in the sea spray zone

Herbarium link:

More info about cushion types

Colobanthus muscoides