 Amylostereaceae usually infest only dead or cut down conifer wood . Three species – A. areolatum , A. laevigatum and A. chailletii – may also establish a symbiosis with wood wasps ( <unk> ) , which beside <unk> logged trees also infest living trees and infect them with fungi . <unk> have been recorded with several species : Sirex noctilio , S. <unk> , S. <unk> , S. <unk> , S. <unk> , S. <unk> , and , in Japan , Urocerus <unk> and <unk> <unk> . <unk> of the genera Sirex and Urocerus store <unk> ( the <unk> of fungi split up to spores ) in special abdominal organs . The wood wasps infect trees by <unk> a <unk> secretion below the bark and at the same time <unk> fungal spores into the hole . The secretion weakens the tree and temporarily <unk> its immune system , whereby the fungus can spread along the <unk> . The infection with Amylostereaceae fulfill two functions for the wasps : it provides the larvae food , because the white rot <unk> the wood ; at the same time , the mycelia of the fungi serves as food for the larvae . After the larvae <unk> , it absorbs the mycelia of the Amylostereaceae into its body to <unk> together with its eggs . The fungus benefits from the symbiosis as it spreads faster and more effectively than through airborne spores and furthermore does not need to develop fruit bodies . A. ferreum is the only <unk> species that has not been associated with any <unk> . 
