Hi, Chris,
I've not heard of Medium Pellia. I know there's a Mini-Pellia and a Coral Pellia but it's highly likely they are one and the same liverwort. With plants, size is not an indicator of species. For instance, the Mini-Riccia is just another form of the normal Riccia. Both are Riccia fluitans but the former would have the term "Dwarf Form" attached to its name. Even then, the Mini-Riccia has been known to morph into normal Riccia after a while.
My bet is that your wild Pellia is either another species of liverwort altogether or it will eventually look the same as your Mini-Pellia.
Loh K L
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