<i>Lycaugea edieae</i> gen. et sp. nov., a Late Devonian Lycopsid from New South Wales, Australia

Premise of research. Resolving the time and patterns origination Isoetales that thrived in wet habitats late Paleozoic have extant representatives genus Isoetes requires a better understanding their early members precursors. Recent studies conducted for large part South China acknowledged diversification Middle to Late Devonian taxa possessed isoetalean traits either were closely related or occupied basal position within this plant order. investigations floras from Australia show area, on northeastern edge Gondwana, also yields with combinations characters unknown elsewhere.Methodology. The anatomy external morphology an anatomically preserved fragment lycopsid axis Famennian locality Barraba, New Wales, are described. new specimen is compared basis specimens ranging Carboniferous.Pivotal results. Barraba shows combination consisting medullated protostele, three-zoned cortex wide middle cortex, homogeneous primary outer presumably deciduous leaves, slightly protuberant widely spaced leaf bases. Leaf bases single parichnos covered adaxially by thick translucent layer. interpreted as distal branch arborescent taxon, Lycaugea edieae. Taxa closest morphoanatomical characters, such Wexfordia hookense, belong found deposits Europe eastern United States.Conclusions. edieae third taxon described which, date, has yielded majority spore-producing plants. It increases diversity around Devonian-Carboniferous boundary. flora more similar contemporaneous southern Laurussia than China.