Geochronology/Lichenometry

"Although free-living cyanobacteria are the dominant group in biological crusts covering the inselbergs, the number of cyanobacterial lichens is relatively high and their distribution is homogenous over long distances and macro-climatic gradients."

"Alectorioid lichens are the dominant group of epiphytic lichens in boreal forests."

"The dominant group of lichens in tropical rain forests are crustose microlichens, a highly diverse assemblage that lacks detailed taxonomic and ecological studies, among them the families Graphidaceae and Thelotremataceae (Wirth and Hale 1963, 1978; Hale 1974, 1978"