ocr: Colonizers Almost any stable surface-like ths gravestone on Cape Cod- E makes suitable turf for lichens. Underfavorable conditions, lichens-wil nomestead on the stalnied-glass.windows of cathe- draisi one abandoned? cars, high- way signs; and roof shingles; even: on: the backsots Galapagost tor- toises and beetlesi ina New Guipea. Growing impéroeptiblyforcan. turies even millennia: some lichens are: among theworld's olda est living things. This makes them usefult to scientists for dating: archaeologcalartiacta and: tracks ing geological events such as the retreat of glaciers Lichens helpt tran ...
