2. Doodie. 1.(n.)an unpleasant word that usually small children use to describe how they don't like someone; just plain creepy when a parent says it. 2.(n.)a nasty brown substance that comes out of your rear and lands in the toilet. 1.child: No I don't want to go into time out! You're such a doodie!.
Yes, moss does begins a very, very large part of its life cycle only on the north side of trees in the US. However, after a very, very long time that the moss has established itself, I'm talking decades here, then the moss will take over the south side too.
Arctic tundra moss grows in areas with some water during the year. They typically make the terrain look greenish (left). When the ground dries at the surface it may crack in areas weakened by the freezing and thawing of the ground each year (right).