Curvularia protuberata is an endosymbiote of panic grass (Dichanthelium lanuginosum) that enables it to thrive near hot springs in soil temperatures of up to 104° F (40° C). The fungus confers this protective effect only when itself infected by the Curvularia thermal tolerance virus (CThTV). Plants unrelated to panic grass also experience this protective effect when inoculated with the virus-infected fungus.[1]