It is confusing. Here is a link to a
discussion that hopefully will clear up the matter.
Except:
Pellia (Pelia), Mini Pellia, and Subwassertang
Pellia and Mini-Pellia (Also spelled Pelia) are both Liverworts. Both can be grown in emersed in moist/humid environments. Both can be used in low light tanks, and require no special care. Generally you will need to tie them to an object in your tank to keep it from floating around the tank. Mini Pellia is much smaller, and grows at a very slow rate. Under low light, in branches out and is not very dense, however under high light it tends to grow as a dense mat. Due to the slow rate of growth, it is normal for mini pellia to become infested with algae.
Neither require CO2 or supplements.
Common Name: Pellia
Scientific Name: Monosolenium tenerum
Plant Profile:
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Common Name: Mini Pellia or Coral Moss
Scientific Name: Riccardia chamedryfolia
Plant Profile:
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Süsswassertang looks a lot like Pellia, and is often sold as "Round Pellia" due to its resemblance to a rounder version of Pellia. Care is very similar, as it does well in low-light, and needs to be tied down to keep it in place. However, it isn't actually a Liverwort and shouldn't be called Pellia. It is the gametophyte form of a species of Lomariopsis, possibly Lomariopsis lineata, making it a fern, not a liverwort/pellia.
Common Name: Süsswassertang or Subwassertang
Scientific Name: Lomariopsis sp (Sometimes identified as Lomariopsis lineata)
Plant Profile:
https://en.wikipedia.org/wiki/Süsswassertang
