Abstract
Seventeen taxa of Hygrophoraceae are reported from the Hawaiian Islands. Of these, six are new species, one a new variety and one a new form of Hygrocybe; two represent new species of Humidicutis; five represent first reports for the Hawaiian Islands; and two taxa are reported but not named because of the lack of sufficient material for accurate taxonomic determination. Fifteen taxa are fully described, illustrated and compared with allied taxa. An artificial dichotomous key to Hawaiian Hygrophoraceae is presented.