These photos show typical habitat for the Cupped Mignonette Orchid - a
paperbark swamp. Very much gumboot country. These orchid were
growing in 10-50mm of water.
This orchid was originally named Hydrorchis cupularis by Jones but was renamed Microtis cupularis 2 years later by Thiele & Brown. (see H&B vol 3 Orchids of South-West Australia)