Rhynia Rhyncostomi • Rhyniaceae · · · Info · Definitions · Characters · · Rhynia · · Text Latin · · Script 6 · · Length Definitions · · · (noun) type genus of the Rhyniaceae; small leafless dichotomously branching fossil plants with terminal sporangia and smooth branching rhizomes. Synonyms: genus Rhynia. · · Noun Definition 1 Characters · · R latin capital letter r U+0052 a latin small letter a U+0061 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E y latin small letter y U+0079