Byssomerulius corium (Netted Crust)

The fruitbody appears on dead wood and may take one of two forms:

1     If the fruitbody develops on the underside of wood lying on the ground it is a flat layer on the wood. This is called a resupinate fruitbody. Initially the fruitbody is white and smooth but with age the surface becomes convolutely wrinkled and there is a colour change. First yellowish and then darker through pale brown to orange-brown, but always paler towards the margin which remains whitish.  

2     If the fruitbody develops on an upright piece of wood it starts as a flat layer but eventually produces a horizontal shelf that grows out from the upper area of the flat growth. This is called an effused-reflexed fruitbody. Initially the fruitbody is white and smooth but with age the surface on the flat part and on underside of the shelf changes in the same way as in case 1 above. The upper surface of the shelf remains whitish ands is finely hairy or velvety.

Look-alikes

A well-developed, effused-reflexed fruitbody should not be confused with anything else. An immature resupinate fruitbody could be mistaken for various other genera, with less chance of confusion once you have both wrinkles AND the brownish to orangeish colour. In our area Ceraceomyces and Leucogyrophana may produce somewhat similar resupinate fruitbodies.