Tenny it is hard to say what kind of wood it is from the picture. It is either Manzanita or Grapevine wood, but it looks to big around to be grapevine wood.

I think you are ok on the wood thing. With as much white mold as you have I would guess you would also see Grey mold if it was Grapevine. As for the moss. Put it in the tank and see how it does. It may surprise you and survive. If it dies off than you have learned another invaluable lesson to take with you to future builds

I have bought my moss from NeHerp and love it. I have used their pillow moss and what they call NeHerp Moss, which emends me of Christmas moss. Josh's frogs sales moss and so does BlackJungle. The thing about NeHerps moss (the one they call NeHerp Moss) i like is that they pre process it before they ship it out to you. So when it arrives you are save to toss it in the tank and watch it grow

You are doing great on this build. We all hit little speed bumps in builds from time to time. It is those "speed bumps" thaw make this interesting, unique, and challenging that keep us all coming back for more Keep up the good work!