The authors describe a new genus Haasiella Kotl. et Pouz. with two species, H. splendidissima Kotl. et Pouz. sp. nov. and H. venustissima (Fr.) Kotl. et Pouz. comb. nov. The taxonomic position of this genus is discussed.
Kotlaba F., Pouzar Z. (1966): Haasiella, a new Agaric genus and H. splendidissima sp. nov. (tab. 62). – Česká Mykologie 20(3): 135–140.