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Convergent Genetic Evolution in Lichen Species

ScienceDaily has recently reported:

A Duke research team has found that lichen that seem identical in all outward appearances and produce the same internal chemicals are in fact two different species, one living in North America and one in Australia. They're an example of "convergent evolution," in which two species evolve separately but end up looking very similar, like the Tasmanian wolf and the American wolf.

So basically this is convergent genetic evolution such that two supposedly distantly related lichen species "seem identical in all outward appearances and produce the same internal chemicals." Now what are the odds of that? (Or is convergent evolution another example of an epicycle used to explain away data that contradicts common ancestry?)