Japanese Maple - Question regarding moss on bark and cracked bark
I have some species of Japanese maple. It's absolutely beautiful - mix of dark red.crimson and green leaves during the spring and summer, red seedlings, about 20-25' high. I *believe* it's a Bloodgood (pics in the 'Name that Plant' forum). Anyway, I'm somewhat concerned for its health for two reasons:
1) It has some form of moss/lichen growing all over the lower trunk area. Does anyone know what it is & if it's harmful? Anything I should do to treat it?
2) I noticed two cracks in bark on the lower trunk running in-line with the trunk. I'd assume it was from a wind storm and torqued the tree too much. Are these cracks something I should do something about (treat them? should I cable the tree above to strengthen it?).
Hopefully you can see both issues in the pictures below. If not, I can post a close up.