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If you have not heard of the term hylophobia, you are about to learn its meaning the hard way.
According to the Macmillan Dictionary, hylophobia is a 'psychological disorder defined by an irrational fear of wood, forest or trees'.
Acid Cow has compiled a series of freaky photos showing just why some people fear the shrubs, plants and vegetation in the great outdoors.
Have a look at them in the gallery above.