Amylostereum areolatum

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Amylostereum areolatum symptoms on Pinus trunk (click on image to enlarge it)
Author(s): Vicky Klasmer, Instituto Nacional de Tecnologia Agropecuaria
Source: Wikimedia Commons

Amylostereum areolatum (Chaillet ex Fr.) Boidin 1958

This fungus is a symbiont of the wood wasp Sirex noctilio. It is carried by the wasps in special mycangia and introduced into living pine trees during attacks by the wasps. It helps the wasp by decaying the wood and making it a suitable food for the wasp larvae. The combination of wasp breeding and wood degradation by the fungus causes wilting of pine trees, and in most cases eventual death of the trees.