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Lichens present a very intriguing problem for people whose job is to name different kinds of organisms.This is because a lichen is not a separate organism in the sense of being one type of individual.
Lichens are distinctive and they form many different, recognizable types.
Many of these have been given specific names of their own, despite the fact that each lichen is already a mixture of different species.
There are more than 1,700 species of lichen in Britain.
Approximately 18,000 species of lichen have been described and identified worldwide.
The algal partners in lichens can be found living on their own in nature, as free-living species in their own right.