These are young heads and are not immediately recognizeable as Rhopalomyces. At maturity the spores on the swollen vesicle become large, football-shaped (American or rugby football!) and rich red-brown. When they germinate, the large spores produce an extensive system of very fine hyphae (1-2 microns in diameter) through the organic substrate. Rhopalomyces elegans is a parasite and specializes in attacking the eggs of nematodes for food. It is probably attracted to the eggs by hormonal secretions. The fungus forms a swollen appressorium on the surface of the egg and then penetrates the 'shell' to exploit the rich food source inside.