A small family of basidiomycetes producing large, tough, often rosette-forming fruitbodies on wood. Caps are typically thick, leathery to corky, sometimes zoned or scaly, and often arranged in overlapping tiers. Undersurface is poroid, with tubes usually white to cream, bruising or darkening in some species. Flesh is firm, fibrous, and often pale. Many species have a central or eccentric stem-like base, though some are sessile.

New Zealand has two species that look very similar but can be told apart by their association with host trees Bondarzewia kirkii grows at the base of beech trees. While Bondarzewia propria is found in association with Podocarps.

Large, rosette-forming polypores with thick, overlapping caps and pale, fibrous flesh. Found at the base of trees or on buried roots, causing white rot. Spores globose, smooth, hyaline.