Lichenes–Flechten from Kunstformen der Natur (1904) by Ernst Haeckel. Original from Library of Congress. Digitally… https://www.rawpixel.com/image/2270511/free-illustration-image-ernst-haeckel-fungi-seaFree Image from public domain licenseCladonia asahinae. (pixie cup lichen)A club lichen, this species is typically found on acidic soil on rotting wood, moss or… https://www.rawpixel.com/image/4022667/photo-image-plant-green-natureFree Image from public domain licenseCladonia species, Beltsville, MD, 2012. Original public domain image from Flickr https://www.rawpixel.com/image/8755892/photo-image-plant-public-domain-natureFree Image from public domain license