There’s a spawn point for a Mislaid Curiosity (Brann XP) that’s on a fungal shelf on the edge of a cliff near the end. The fungal shelf has no collision, so you fall right through it, making it difficult (if not impossible) to loot the item.
Edit: There is some collision on the cliffside directly below the fungal shelf, allowing the item to be looted, but it’s pretty difficult to land on it (and doesn’t look like there should be collision).
For anyone that comes here later, because of this issue, here is a solution for you.
Any class that has some kind of jump ability, like Leap (Warrior), Disengage (Hunter), or Gust of Wind (Shaman) can easily get this by standing near the rock and throwing yourself up there.
For classes that cannot do this, you can stand on the edge of the spore’s explosion radius (the one closest to this curiosity), and have it blow you up towards the rock. NOTE: You will need to make sure you keep yourself healed, as it does stick a dot on you.