Serpula (fungus) cover the surface they are growing on (known as the substrate). The hymenophore, or spore-forming surface, generally has a wrinkled appearance. The species grow on, and digest, mainly coniferous wood, causing a process known as brown rot. One species, dry rot ("S. lacrymans"), is a highly destructive agent of houses. Damp structural timber is an ideal substrate for the germination of "Serpula" spores. The fungal hyphae penetrate the wood and release enzymes that break down structural polysaccharides such as cellulose. There may be no external indications that the fungus is present until the rot is far advanced and fruit bodies
The Amity Affliction of the year. It was announced by Joel Birch on 24 March 2013 that Dan Brown was the new guitarist,<ref name="instagram.com/joeldtd">, http://instagram.com/p/XOQl3mQs5q/</ref> although he did not appear on the "Open Letter" music video. In 2013 The Amity Affliction was part of Warped Tour in the United States with Chad Hasty (Glass Cloud) on drums and percussion due to Ryan Burt severely damaging his cornea during a set in Portland, Oregon. Later in the tour vocalist Joel Birch was also hospitalized due to unspecified illness, forcing the band to cancel their set in Pittsburgh. The band's next show in Cleveland was