Two small gymnopoid fungi from the southern Appalachian Mountains and Massachusetts, Collybiopsis complicata sp. nov. and C. prolapsis sp. nov. , are identified and described. A new generic nrITS-LSU phylogeny of Collybiopsis places C. complicata and C. prolapsis in a small clade together with C. minor , and an unknown taxon from Arkansas. This clade adds to the growing circumscription of Collybiopsis (= Marasmiellus ).
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Petersen et al. (2024) studied this question.
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