the root (no rank)
Eukaryota (domain)
Viridiplantae (kingdom)
Embryophyta (phylum)
Marchantiophyta (subphylum)
Marchantiopsida (class)
Ricciales (order)
Ricciaceae (family)
[hide inferior taxa]
Riccia fluitans (species)
Ricciocarpos natans (species)