This is the inner lining of an operculum ( cap ) from the bud of a Eucalypt tree. I hadn't ever realized that the little cap on the Eucalypt bud had a partly transparent lining.
@koalagardens LOL Katrina! This is another camera setting that lets you choose to customize how the camera shows the image - you can set red, blue, green, contrast, saturation, sharpness and skin tone all in the one go. This image is using all at max! Pretty crazy! :)