colored lichens on eroded coastal cliffs of gozo island, malta

algae algal flora botany brown closeup coastal limestone covered crimea disclike apothecia ecology fungi geological geology gray lichen greenish yellow growth lace on rock lichenes lichenology lichens moss natural stones nature old stone parmelia photosynthetic plant layers sporophyte spots surface texture thallus wild xanthoparmelia sp xanthoria colorful fungus symbiosis symbiotic outdoor dry seaside beach