Short title: Glutinoglossum Studies in the genus Glutinoglossum Vincent P. Hustad Department of Plant Biology, University of Illinois at Urbana-Champaign, 505 S. Goodwin Avenue, Urbana, Illinois 61801 Andrew N. Miller Illinois Natural History Survey, University of Illinois at Urbana-Champaign, 1816 S. Oak Street, Champaign, Illinois 61820 Abstract: Glutinoglossum is a recently described genus in Geoglossomycetes, characterized by viscid black fruiting bodies. Glutinoglossum was described based on molecular evidence showing that the fungus formerly known as Geoglossum glutinosum formed a well-supported clade separate from Geoglossum. This study provides a comprehensive examination of Glutinoglossum based on maximum-likelihood and Bayesian analyses of a dataset that includes nuc rDNA internal transcribed spacer and partial 28S regions and the nuc genes for RNA polymerase II largest subunit (RPB1) and minichromosome maintenance complex component 7 (MCM7). Four new species are described, an emended description of Glutinoglossum glutinosum and a key to the genus Glutinoglossum is provided. Key words: Ascomycota, earth tongues, Geoglossomycetes, Geoglossum, new species, systematics INTRODUCTION Geoglossomycetes, commonly referred to as earth tongues, is a class in the Ascomycota presently comprising one family (Geoglossaceae) and eight genera: Geoglossum Pers., Glutinoglossum Hustad, A.N. Mill., Dentinger & P.F. Cannon, Hemileucoglossum Arauzo, In Press at Mycologia, preliminary version published on February 27, 2015 as doi:10.3852/14-328 Copyright 2015 by The Mycological Society of America.