Maxicard from Australia.
Umbilicaria decussata, being foliose, is one of the tallest lichens in the Australian Antarctic Territory (AAT), growing up to 10 millimeters in height. It looks and feels like grey-black cornflakes stuck to rocks. It is highly susceptible to human disturbance, as a misplaced footstep can easily break off the leaf-like structures. It’s often found growing close to Buellia frigida but in the more sheltered part of a rock jumble. Its structure allows for the entrapment of soil, dust, and guano particles which are accessed to aid growth. The stamp photograph is by Dana M Bergstrom.
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