Jen Parker (October)
This is Reindeer Moss (Cladonia Rangiferina) photographed in the Moelwyns.
It is a lichen of the Cladonia family and it is prevalent in mountain and moorland areas of Britain and particularly in Scotland.
It is edible (actually tastes a bit like chicken) and is used by birds like the golden plover as nesting material.
The name comes from the fact that in certain countries, including Lapland, Reindeer Moss is used as fodder for reindeer and has significant economical importance as a result.
Like many lichens though, it is slow growing (3-5 mm per year) and may take decades to return once overgrazed, burned, trampled, or otherwise consumed.