Endoptychum

Endoptychum is a genus of secotioid fungi in the family Agaricaceae. Like the majority of secotioid taxa, the individual species of "Endoptychum" are thought to be recent mutations from agaricoid species, hence, "Endoptychum" is likely not a valid monophyletic genus.
So far, molecular phylogeny and morphological study has revealed that "E. depressum" clearly is a species of "Agaricus" and "E. agaricoides", the type species, is a species of "Chlorophyllum". "E. depressum" has been renamed "Agaricus inapertus" Vellinga. Recognition of the name "Chlorophyllum agaricoides" (Czern.) Vellinga would entail deprecation of the entire genus name "Endoptychum" in favor of "Chlorophyllum" and awaits a formal decision of the International Botanical Congress.
"E. agaricoides" is inedible.