Is this a Den. nobile or Den. phalaenopsis?

[Fairorchids]

It is not a Den phalaenopsis type.

At first glance it looks like a nobile type. However, it appears to have leaves on all bulbs, and nobile types are decideous, so it is not a nobile type either.

There is nothing wrong with spaghnum in the rootball for Dendrobiums potted in small clay pots. As a matter of fact, that is how I grow most of my Dendrobiums (I only use a significant amount of bark for my kingianums & other Aussies).

Last comment, you could probably have used a pot one size smaller. Dendrobiums like being in small pots.