George wrote:
In any case, take a peek at someone who does it differently.

http://www.fpl.fs.fed.us/documnts/te...alted_wood.pdf

Now at least I know what to tell people who ask me how those black lines
are created ... boundaries between territories of competing fungi! A
bit like the lines you get on really old rocks where colonies of
different lichens meet I suppose.

--
Alun Saunders