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- Moisture: Aquatic
- Habit: Perennial
- Uses: Ornamental
Süsswassertang (German spelling: Süßwassertang; see ß) is a type of Aquarium plant formerly known as "round Pellia" or "round-leaf Pellia". It was long considered to be a liverwort, which it strongly resembles, but recent genetic analysis has determined that it is, in fact, an indeterminate Fern Gametophyte. Further, it is a species of Lomariopsis.<ref>Li, Fay-Wei; Benito C. Tan, Volker Buchbender, Robbin C. Moran, Germinal Rouhan, Chun-Neng Wang, & Dietmar Quandt (2009). "Identifying a mysterious aquatic fern gametophyte". Plant Systematics and Evolution 281: 77–86. doi:10.1007/s00606-009-0188-2. ISSN 0378-2697. http://www.springerlink.com/content/ep72n52715248962/. </ref> It is closest to Lomariopsis lineata, but may be a new, unnamed species. Many reference sources on the web describe it as L. lineata, but that has not been validly determined. Efforts to induce the plant to form a Sporophyte have failed, which may indicate status as a new species.
The name means "freshwater seaweed" in German.
This plant was first mis-identified as Pellia endiviifolia, then as Monosolenium tenerum, before the analysis that determined its true status.