Rigidoporus laetus

"Rigidoporus laetus" is a species of polypore fungus in the family Meripilaceae. It was originally described in 1883 as "Polyporus laetus" by Mordecai Cubitt Cooke. Peter Buchanan and Leif Ryvarden transferred it to "Rigidoporus" in 1988. Found in south Australia, the fungus is a plant pathogen that causes white rot in "Eucalyptus".