lichens on the bark of an old tree, different types of lichens growing on tree bark

lichen tree ascomycota basidiomycota chlorophyta trebouxiophyceae trebouxiaceae ulvophyceae trentepohliaceae prokaryote symbiosis fungus algae cyanobacteria crustose foliose fruticose macrolichen microlichen epiphytic thallus soredia apothecia ascocarp mycobiont photobiont mutualism biodiversity ecology nature forest old growth texture pattern closeup macro green gray yellow species identification taxonomy classification morphology diversity ecosystem