black lichens on the rock

aged algae ascomycota background black campylothelium closeup color cracked crustose dichotomous ecology effect environment eurotiomycetes foliose fruticose fungi grain growing kitchen leprose lichen lichens macro material mold moss natural nature nitidum old pyrenulales rock rough squamulose stain stone style surface systematics taxonomy texture textured thallus trypetheliaceae wall weathered white