 In 1991, at the earliest possible date, Moser retired from his teaching position to avoid the administrative burden and to focus on his research into Cortinarius and related genera. After his retirement, he continued to work heavily, typically beginning at 5 am. In 1992, he researched the presence of Agaricales in the Crimean Mountains, identifying 70 previously undocumented species, including some new to science. In 1995, in celebration of Moser's 70th birthday, a supplement of Sydowia was published in his honour.
