A simple rather seed has been found by Nexy, a Youtuber you will meet in the video below. The spawn quite simple like mostly seed, spawn in a grass landscape field, but if you turn right at behind you you will see a large mushroom. If you want to see more mushroom you can looking around the seed and lots of mushroom can be seen made it look like a forest of mushroom.
Seeds : a new adventure Work in PE ver0.9.0+ or ver0.9.5