On an old stone wall grows between the mosses a very small reddish plant. It is the Rue-leaved Saxifrage (Saxifraga tridactylitis).
It has a short life, in a few weeks it has grown from seed, now it flowers and soon the seeds will disperse and after that the plant will die. There are many such tiny plants. In the picture below you see on the same wall between three Rue-leaved Saxifrages another species, the Common Whitlow-grass (Erophila verna).
