Hunting Quest: Slay 12 Altaroth
Time: 50 min.
Area: Deserted Island
Subquest A: Deliver 2 Ripened Mushroom
Subquest B: Deliver 1 Choice Mushroom
Altaroths can be found in Areas 2, 3 and 7. Since you're only up against bugs here (albeit big ones), completing this quest should be a cinch. Completing the two subquests might not be as easy, as doing so requires a bit of luck.
Choice Mushrooms are quite uncommon. These mushrooms can be found at common mushroom gather spots, but come more easily from gather spots that appear as a patch of white toadstools. Spent gather spots will reappear eventually, so just keep checking Areas 2, 3 and 7 for them.
As for Ripened Mushrooms, there's a chance Altaroth that have a large, blue abdomen will drop one when killed. The abdomen of Altaroth swell when they feed at a gather spot. Hang around Area 2 long enough and you may see these Altaroth. After killing an Altaroth that has a large, coloured abdomen, gather at the glittering spot that appears on the ground to collect the item the Altaroth dropped.
Altaroth that have a large, blue abdomen will sometime drop a Ripened Mushroom when killed.
Completing these subquests yields only an additional 500z per quest and some minor loot, so don't fret if you're unable to find these rare mushrooms.
Be sure to deposit any subquest items in the Delivery Box at Base Camp before killing a twelfth Altaroth, as the quest will end as soon as you do.