ID 280149929 © Gubernat | Megapixl.com
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lichen thallus rock limestone mountains nature environment closeup macro squamarina lamarckii stereocaulaceae lecanoromycetes squamulose rocks rare apothecia lecanorine rounded irregularly squamules whitepruinose natural habitat rocky symbiosis fungus algae cyanobacteria crustose ecology botany endangered park reserve vertical developed poelt dc rock