Süsswassertang

Süsswassertang was first discovered in the aquarium of botanist Christel Kasselmann in 2001, who then distributed it to other hobby aquarists. The wild origin is unknown. The name Süsswassertang means "freshwater seaweed" in German.[2] It is commonly incorrectly spelled "subwassertang" due to the German eszett's similarity to the latin B.

In 2009, molecular phylogeny determined it is most closely related to Lomariopsis lineata.[1] Reference sources may describe it as L. lineata, but its inclusion in that species has not been validly determined. Efforts to induce the plant to form a sporophyte have failed, which may indicate status as a new species. All specimens in the aquarium trade are assumed to be clones of the original plant introduced in 2001.[3]

This plant was first mis-identified as Pellia endiviifolia before the analysis that determined its true status. It was formerly known as "round Pellia" or "round-leaf Pellia".

Reproduction is by fragmentation. Pieces that break off develop into new plants. The plant is thalloid in form, and exhibits indeterminate growth. It is profusely branched, and 1 cell-layer thick. Gametangia are rarely produced. The archegonia have short necks and the venter (base) is partly sunk into the thallus. The antheridia are like those of polypodialean ferns in that they consist of a basal cell, a ring cell, and a cap cell.[1]