Old Man Lichen

Here lives Old Man Lichen
you can see where he has been,
draping every branch and rock
in beards of grey and green.

He's very, very old you see
and needs a walking stick...
but should a human frighten him,
he 'takes off' double quick!

For really he is very shy,
although he looks quite scary...
and he'd really be quite handsome
if he weren't so very hairy!