Legerioides, a new genus of Harpellales in isopods and other Trichomycetesfrom New England, USA

New England (northeastern USA), essentially, has not been surveyed for Tric homycetes. During two trips to this region, samples of aquatic arthropods w ere collected and dissected for identification of their gut fungi. Explorat ory collections in Massachusetts and New Hampshire yielded a new genus and species of Harpellales found in the hindguts of a common freshwater isopod. Legerioides tumidus is described with comments on the possible range of di stribution of this species. As a preliminary assessment of the Trichomycete s in New England, the gut fungi associated with various aquatic arthropods are also presented. This paper includes the first report of a Harpellales i n Isopoda, the first report of Trichomycetes from Trichoptera, the first re port of Eccrinales in Plecoptera, and a new record of Astreptonema gammari in North America.