Mycena austera and Mycena parca, belonging to section Fragilipedes, are proposed as new species. Mycena austera is identified mainly by the 4-spored basidia, the absence of clamp connections, the dark pileus, and the nitrous odour. The species is compared with M. leptocephala and M. deceptor. Mycena parca is compared with M. leptocephala from which it differs mainly on account of the absence of nitrous odour, and differently shaped cheilocystidia and terminal cells of the cortical layer of the stipe.