Habitat and identification

The netted crust (Byssomerulius corium) is a common crust fungus, that can often be found growing on dead deciduous wood, such as birch, oak, beech and alder. The fungus forms a tough white crust that can cover the surface of dead wood sometimes extending past the surface forming shelf like structures that can vary in size and structure. With the shortest shelfs measuring only a few millimetres and the larger bounds reaching 10 or even 15cm from the wood, the surface of the netted crust is covered in tiny net like structures or ridges, known as meruloid patterns, this is where the “merulius” part of its name originates. These ridges often form very intricate patterns and channels. The netted crust is often referred to as a resupinate fungus, meaning the fertile surface of the mushroom faces upwards, instead of being sheltered on the underside of the mushroom, this means when their spores are released they rest on top of the fungus, and wind or water droplets may aid in their distribution, the netted crust grows in a range of colors, often starting off a crisp white, and yellowing with age, however the degree of weathering can vary depending on the conditions of the habitat, which can lead it interesting patterns forming between white cream and yellow rings of the crust. The growth of netted crust can vary greatly with some patches overtaking whole sections of fallen logs, whereas others may only occupy a small twig or fallen branch. The netted crust can be found most in the damper months, particularly around autumn and winter, making it an interesting site in the cold and empty winter months.

Folklore and Medicinal use

As with most crust and bracketed fungus they often have roots tied deep into European folklore and fairies, and often fungi that looked interesting such as those with unique structures or textures, like the fertile surface of the netted crust, and its intricately patterned underside may have attracted attention in the past. As similar fungi were often associated with woodland sprites, spirits or faries, and were sometimes used in symbolic rituals/practices.