SUMMARY
Nine new species of Marasmius (Basidiomycetes, Agaricales, Tricholomataceae) are described from the northeastern United States and southeastern Canada. Three species are in section Chordales (Marasmius olidus, M. uliginosus, and M. insipidus), four in section Sicci (M. borealis, M. spissus, M. armeniacus, and M. spadiceus), and one each in sections Epiphylli (M. epifagus) and Androsacei (M. paltidocephalus).