Do Teemo's mushrooms do physical damage or magical damage?

I ask because I'm curious about how armor / magic penetration would effect the mushrooms... Or do they not effect the mushrooms at all?

How about his other abilities (Blinding Dart and Poison), how are they affected by magical / armor penetration?

Pretty sure the mushrooms deal magic damage.

Toxic Shot and Blinding Dart I'm also fairly certain are magic damage as well.

I'm always uncertain what skills are magic or physical. Would be nice to have a little more clarification.

It typically says what kind of damage an ability does in its tooltip.

Pretty sure most abilities do Magic Damage by default (what you assume), until otherwise noted that they deal physical damage.