Phylum: Ascomycota Family: Cordyciptaceae
Cordyceps militaris (L.) Link
Scarlet Caterpillar Club
A parasitic fungus attacking the larvae of underground lepidoptera. Infrequently recorded but probably overlooked
References:
Breitenbach & Kranzlin (1984) Fungi of Switzerland, Volume 1, Ascomycetes
O'Reilly (2016) Fascinated by Fungi