Xanthoria parietina by michiel de haseth, via Flickr
Pixie Cup lichen from a pretty awesome website about all kinds of mushrooms, lichen and fungi.
Peltigera venosa Lichen and Moss ~ By Ken-ichi Ueda
Lichen by alpha8 on DeviantArt
Lettuce Sea Slug
bethy was inspired by peeling paint on london's decaying buildings
Fungi mushrooms really like the delicate lines really pretty looking for a mushroom
Plant stem section under the microscope. Detail.