Okay. A decurrens has typical "wings" running along stems; check out CNM for instance https://canberra.naturemapr.org/sightings/4463598. "wings" are obvious on young plants and young stems
Both species - mearnsii & parramattensis - are present at Mt Majura.... I always have difficulties to distinguish the 2 species; parramattensis can have small glands between the bigger glands at the base of the leaflets but I agree: the velvety stems seem to indicate mearnsii.