 The main distinguishing feature of "Leptotrimitus" was the presence of trimitic hyphae.In 1971, Marinus Anton Donk reunited "Incrustoporia" and "Leptotrimitus", as he did not believe that the trimitic character alone was a sufficient criterion for delineating a new genus when so many other characters were identical.Jean Keller studied the ultrastructure of the encrusted hyphae of "Incrustoporia" species using electron microscopy.