Gongylidia

Gongylidia (singular gongylidium) are hyphal swellings of fungus cultivated by higher-attine genera of fungus-growing ants.

This fungus no longer exists naturally outside the ant colonies.

[1] They are ellipsoid, about 30–50 micrometres in diameter,[2] rich in lipids and carbohydrates derived from the leaves,[3] and are produced in clusters (called staphylae).

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French depiction of gongylidia and staphylae in different sizes
Photograph of gongylidia (G) and staphylae (S) in a fungal garden taken care of by Acromyrmex echinatior