Tetramelas confusus is a species of crustose lichen in the family Caliciaceae. Found in the South Island of New Zealand, it was formally described as a new species in 2002 by Anders Nordin. The type specimen was collected by David J. Galloway in the Old Man Range / Kopuwai (Otago) at an elevation of . The lichen is only known to occur in the Central Otago mountains, where it grows in alpine grasslands on dead grass, plant detritus, and old rabbit droppings. It has a thin, creamy-white to greyish-white thallus that spreads irregularly. Its ascospores are ellipsoid in shape, thin-walled with a single septum, and measure 13–25 by 5–7·5 μm. Secondary chemicals found in the lichen include 6-O-methylarthothelin (major) and atranorin (minor). Similar species include T. papillatus, T. insignis, and T. graminicolus.
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Tetramelas confusus
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