tumblelichen: https://en.wikipedia.org/wiki/Vagrant_lichen↵potentially extraterrestial lichen: http://www.sciencedirect.com/science/article/pii/S0032063313002055↵chthonic lichen: https://en.wikipedia.org/wiki/Endolithic_lichen
tumblelichen: https://en.wikipedia.org/wiki/Vagrant_lichen↵potentially extraterrestial lichen: http://www.sciencedirect.com/science/article/pii/S0032063313002055↵chthonic lichen: https://en.wikipedia.org/wiki/Endolithic_lichen