Confidence: I'm as sure as I can be.
Notes: A good set of photos which should allow a definitive id between G applanatum and G australe but....
On the second photo there is a distinct sterile layer just above the new tubes for almost the full width of the fruit body - G applanatum
unfortunately the last photo looks to show no layer between each years growth - G australe.
The only suggestion I can come up with is that the last picture shows just one years growth of G applanatum with splits at some time during the growing season may be due to the weather.