I found some swan greenhoods in this same area of Black Mountain a few days ago. I went back today and saw these ones too, but am unsure if these are also swans or if they are black tip greenhoods? I am still confused after looking at my orchid book, and would love any tips to help me differentiate. Thanks!
The black/green appendage on the labellum is used to differentiate them. H. bicolor has a large black M-shaped appendage, H. muticus a large green (same colour as the rest of the flower) M-shaped appendage, and H. cycnocephalus a small dark green T-shaped appendage.