thumb|right|Minni ritchi bark on an acacia in the Pilbara region of Western Australia thumb|right|Minni ritchi bark of Eucalyptus crucis near Wongan Hills
Minni ritchi is a type of reddish-brown bark that continuously peels in small curly flakes, leaving the tree looking like it has a coat of red curly hair. Brooker and Kleinig (1990) formally described it as a bark type in which "the outer rich, red-brown smooth bark splits both longitudinally and horizontally, the free edges rolling back without completely detaching to expose new green bark beneath".
A number of species of Acacia and Eucalyptus have minni ritchi bark, including: