Scientists sequenced the genome of a fungus called Rhizina undulata that uniquely depends on fire to activate its growth and infect conifer trees. By comparing this fungus to related species, they discovered it has extra copies of genes that produce special proteins for handling heat stress and dealing with the chemical changes that occur after fires. This finding helps explain how the fungus survives extreme heat and thrives in fire-damaged forests, which is important knowledge for forest management.