I have a number of japanese maples which I have collected over the years, but still have two which I have not yet identified. I would really appreciate it if somebody could help me. The first is a linearilobum which has a vertical habit. It had a lot of dieback last year and I pruned it right back. This year it appears to be a lot healthier. The leaves do not turn yellow in Autumn and I thought that it might be an atrolineare. The second is a dissectum with a domed shape. This tree had a lot of dieback over the Winter and only a few of the branches have leafed out. I thought that this might be an orangeola although there appear to be a lot of dissectums which appear similar.