If you’re looking to collect the rarest materials in Avatar: Frontiers of Pandora, the Pale Vineshroom is probably the last one you need. Luckily, there are no special conditions to make them spawn; you just need to know where they are.
On the Threaded River near Dyer’s Falls
There are exactly three Pale Vineshrooms in the world, and they are located under a large vine spanning the Threaded River near Dyer’s Falls in the Kinglor Forest region. You’ll need to ride your Ikran to get to them, since you can’t quite reach under the vine to gather them on foot.
The best quality Pale Vineshrooms are harvested during a thunderstorm. To trigger a thunderstorm, go to the nearest Na’vi camp (Stone Refuge) and pass time by the fire. Keep passing time until you get a thunderstorm.
If you don’t want to bother with the weather but still want high-quality materials, you can cook and eat a Relun’s Fish Stew (Mudcrawler Fish + Crimson Mushroom) or Novao’s Mushroom Pie (Cloud Spitter Seed + Vineshroom). These recipes require Superior quality ingredients.
How to gather Vineshrooms
If you’ve never collected Vineshrooms before, they work a little differently from other plant gatherables. There’s no gathering minigame, you just have to hover close enough on your Ikran. The range is a little finicky, but keep adjusting your position until your character reaches up and grabs it.
If it doesn’t appear to be working for you, check to make sure that you don’t have a weapon in-hand and that your ingredients inventory isn’t full.