Gymnopilus austrosapineus (?), said
(Bougher and Syme) to be very common in WA/SE Australian forests. On rotting wood, esp. buried in the ground. Cap 10-40 mm, bright orange-brown, minutely scaly, with paler colour around the cap margin, expanded with slight umbo. When young, has white remnants of a thick white inner veil, remnants of which occur as a fibrillose zone on the stem, but no obvious ring. Gills deep, close, cream when young, bright yellow, then bright yellow-orange, developing rusty stains when aged. Spore print rusty orange.NB: Unsure of id., but suggested by Tom May from photo. Police Paddocks, Churchill N.P.,2003. 38 kB
Gymnopilus ferruginosus, (previously called G. penetrans), is a wood-rotting fungus on well-rotted logs in eucalypt forests. Cap to 70 mm, golden brown, convex, dry with darker fibrillose scales, margin distinctly paler mustard yellow. Gills initially cream, then dull gold; spore print yellowish brown. Stem brownish orange, no ring.
NZ Landcare ref Kaimai Bush ref Mortimer Picnic Ground, Bunyip State Forest, May, 2010.