DnDChick
Demon Queen of Templates
The 4-book series is called the "perfect collection," but the 4-book and the 7-book series have the same story. The 7-book series is just broken into smaller books.
As for the forest, Nausicaa and Asbel were in a hollowed out section beneath the forest. It doesn't collapse right away because the massive root systems of all the fungi petrify and make the cathedral-like caves. Once all the fungus overhead dies, it does eventually collapse. All the insects do is protect the forest, which is why they get so nasty when its attacked. I really can't explain more without going into spoiler territory for those who are reading the manga.
As for the forest, Nausicaa and Asbel were in a hollowed out section beneath the forest. It doesn't collapse right away because the massive root systems of all the fungi petrify and make the cathedral-like caves. Once all the fungus overhead dies, it does eventually collapse. All the insects do is protect the forest, which is why they get so nasty when its attacked. I really can't explain more without going into spoiler territory for those who are reading the manga.