One of my EVER favourite stamps, from Belgium. It puts together two of my passions: the Smurfs and the mail. I wish I receive more stamps with Smurfs!
I did not find any mushroom among my incoming or outgoing stamps. Well, the Smurfs live in mushroom houses... So I upload this stamp to introduce you one of the most amazing themed collection of covers, stamps and maximum cards: Mushrooms on Stamps, gathered by Alberto. I had never realised that there are so many stamps related to mycology.