Simple Online Photographic Dictionary

a visual dictionary that can be used as a children's picture dictionary,
an English language learning tool or a cross-cultural reference.
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Lichen

Photo of lichen on a rock
Lichens are not a single plant themselves, they are actually a fungus and algae growing together. The result, lichen, is completely different to both of its parts. Lichens can grow almost anywhere, but prefer to grow on tree branches or on bare rock. Lichen is often seen growing on gravestones, statues and roof tiles.

Photo by BinaryApe