Found inside old boot. Looks like it is build from resin. Similar shape to our common mud wasp nests but look, texture and strength completely idfferent
Growing on lopped, live Leptospermum scoparium trunk
Rhodocollybia eucalyptorum growing at foot of old, well established Eucalyptus regnans (Mountain Ash) alongside the creek and near the lower dam in the Dandenong Ranges Botanic Garden.