For the item gathered from the Hunter nodes in the main front area, see Fungal spore
Fungal spores are the skilling nodes that appear on the dagannoth carcass in the Croesus encounter. Fungal spores can be caught from them. Each of the three nodes is in different state, a regular one, a sparkling one which gives more progress and a darkened one, which reverts progress and gives rotten fungus instead. Players need to deplete the carcass during the fight and use 10 rotten fungus on a node to stop the Croesus from reinfesting the carcass.
This information has been compiled as part of the update history project. Some updates may not be included - see here for how to help out!