The Hairy Stereum (Stereum hirsutum) is a plant pathogen. S. hirsutum is in turn parasitised by certain other species such as the fungus Tremella aurantia. Substrates for S. hirsutum include dead limbs and trunks of both hardwoods and conifers. They can bee seen all year round and the irregular tiers of brackets are usually orange. They can be variable in colour and they have wavy margins about 1mm thick.