 The Amylostereaceae produce crust @-@ like , dry and <unk> @-@ <unk> fruit bodies on the bark of infested trees . The fruit bodies are 0 @.@ 5 – 1 @.@ 5 mm ( 0 @.@ 02 – 0 @.@ 06 in ) thick , irregularly shaped and are able to cover a large surface on the bark or otherwise can appear as small spots . They lie directly on the bark . The <unk> , grey or brownish fruit body ( hymenium ) has a smooth to <unk> surface texture and is turned outwards . It is bordered by a highly bent and wavy ( <unk> @-@ <unk> ) edge on all species except A. laevigatum , which has a <unk> surface ( a tomentum ) and is usually dirty @-@ brown coloured . In some species , the tomentum stands clearly above and forms a kind of roof above the fruit body ; if it completely surrounds this roof , there might appear <unk> shapes . 
