Additions to the Rust Fungi of Hawai'i

In a 1989 publication, the 74 species of rust fungi (order Uredinales) known to occur in Hawai'i were listed, based on newly collected material; herbarium specimens, principally those at the Bernice P. Bishop Museum (BISH); and information provided by F. L. Stevens in his 1925 publication on Hawaiian fungi. Stevens had noted an underrepresentation of this group in Hawai'i, which he attributed to the archipelago's isolation from continental landmasses. Since the time of the 1989 publication, 16 additional rusts have been recognized in Hawai'i. These include both recently introduced species, such as Coleosporium plumeriae Pat. on plumeria, and those recently discovered, such as Puccinia rugispora Gardner and P. rutainsulara Gardner on endemic Rutaceae. New host and location records and other important updating information on this well-defined group of fungi in Hawai'i are also included.