 Meinhard Michael Moser ( 13 March 1924 – 30 September 2002 ) was an Austrian mycologist . His life 's work principally concerned the taxonomy , chemistry and toxicity of the gilled mushrooms ( Agaricales ) , especially those of the genus Cortinarius , and the ecology of ectomycorrhiza . His contributions to the Kleine Kryptogamenflora Mitteleuropas series of mycological guidebooks were well @-@ regarded and widely used . In particular , his 1953 Blätter- und Bauchpilze ( Agaricales und Gastromycetes ) , which became known as simply " Moser " , saw several editions in both the original German and in translation . 
