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Marchantia polymorpha is a 'dull green'; M. berteroana has brighter green thallus and also has transparent scales on the underside of the thallus which help distinguish it from Marchantia foliacea which has dark purple-brown scales. M. polymorpha has a dark streak in the center of the upper surface: subsp. polymorpha (continuous), subsp. ruderalis (fuzzy), but subsp. montivagans never has such a streak ...
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