Marasmius sp. (rhizomorph)Fungi, Natural History, What is this? About this Taxon Order: Agaricales. Family: Marasmiaceae. Genus: Marasmius Fr.. Conservation status: Unknown. Collections & Observations Obs. (nest) M. A. Neves 1410 (09/09/2019). Obs. (M. A. Neves, 19/01/2020). Obs. (nest Cacicus chrysopterus, 25/09/2019).