English: Wilsons Promontory National Park. The Cordyceps are a group of Fungi that parasitise insects. Commonly a caterpillar (in this case) may feed on the roots of a tree, and become infected. Later at the appropriate time (Autumn) a fruiting body will emerge from the buried caterpillar and rise from the ground as a tombstone marking the location of the unfortunate caterpillar, allowing the spores to spread and provide opportunity for the fungus to infest other caterpillars. The damp forest of Lilly Pilly Gully, Wilson's Promotory in Autumn is a wonderland of fungi.