Cordyceps gunnii

Cordyceps gunni the vegetable caterpillar, yellow stem, dark green head, without demarcation between head and stem. Stem, with deep groove, fades to white where it starts to meet the parasitised caterpillar. Found in dense pine forest, Belanglo State Forest, April 10, 2017.

Cordyceps are a group of fungi which parasitise insects and arachnids. They often produce chemicals which forces the animal into unusual behaviour, such as a caterpillar burying itself.