A very simple form resulting in a stable, functional little bowl.....with a good finish.
As for the timber....with the thousands of commercial timbers to choose from, world-wide, this is a question fraught with difficulty. Without more precise pictures, especially a close-up of the end-grain, it's a risky business trying to pin it down. My best guess is that it's a spalted beech. How much do you know about the wood? Where did it come from? Was it a local piece of timber, or bought from a merchant? A few clues might help.
Les