Practically any wood works but I try to use wood that resists rotting, such as cedar, cypress, and cork. You can also use teak/cedar lattices as mounts. For me at least, natural, Portuguese cork slabs are ideal for any epiphyte. It is super light, will never rot, does not retain water, resists mold/mildew, and has 10X the "footholds" of any other substance. The only downside of cork is that it is expensive compared to other woods. I would resist using treated lumber, such as treated plywood. The chemicals used on this lumber are generally not kind to plants.
