The message k
from "Phil L" contains these words:

Lichen is like a flat green blob (looks a bit like the droppings of a wood
pigeon) like this;
http://www.pixero.com/bilder/downloa...and_lichen.jpg

Or yellow.
http://www.skipweasel.pwp.blueyonder...ges/lichen.jpg

Looks like a Dr Who cornflake.

--
Skipweasel
Pay no attention to that man behind the curtain.