argghhh. Moldy linoleum hiding wet wood underneath?

Yes, pull that back and see what it looks like underneath. If dry then your in pretty good shape. Is the linoleum in a cabinet in the corner or exposed? If in a cabinet you need to pull it back and see if it is wet. You should be able to tell from knocking on it. The wet wood will have a more dull sound where the dry floor will be more resonate and tight sounding. Are both corners discolored?