One of the things I loved most about spending time in remote mountain areas of Iceland was when you'd walk through an apparently pretty barren landscape, then come across patches of vivid bright green moss, which was even cooler as it has the capacity to hold large coherent droplets of water on top of it without soaking it up!

This particular example is of Pohlia wahlenbergii (I think!) is recolonizing an area buried by a deep layer of andesitic tephra from the 2010 eruption of Eyjafjallajökull. Taken in September 2010 on the south side of Eyjafjallajökull, this was first drop for the tephra which made it across Europe and the Atlantic!