On Omphalia and Omphalina

Abstract
Agaricus epichysium Pers. ex Fr. is selected as lectotype for Omphalia (Pers. ex Fr.) S. F. Gray and Omphalina Quel. Previously proposed lectotypes [A. ericetorum, A. umbelliferus, A. adustus, A. infundibuliformis, A. cyanophyllus, A. hydrogrammus, A. campanella and A. tardus] for Omphalia and Omphalina are critically examined and rejected as being chosen by mechanical systems or through misinterpretations of the protologues.

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