Silvery Bryum (Bryum argenteum, 银叶真藓).
A hardy moss: it grows on every continent including Antarctica, and can live even in deserts and heavily polluted cities. Often spread via the soles of shoes of clumsy travellers, here it is as a successful colonist growing on the rocks on Yuelu Mountain. Unlike many species of moss require a microscope and trained eye to identity it is also, with its distinctive cylindrical shoots, instantly recognizable.
