Karl von Keissler (13 March 1872, in Vienna – 9 January 1965) was an Austrian lichenologist and mycologist.
From 1899 to 1938, he performed various functions in the botanical department at the Naturhistorisches Museum.
1981) bears his name,[5] as do the mycological genera Keissleria (a synonym of Broomella Sacc.
[6]) and Keissleriella (both were named by Franz Xaver Rudolf von Höhnel).
Similarly, Keisslerellum was published by Werner in 1944 before becoming a synonym for Mycoporellum (Müll.Arg.