Barthelia
genus
type species: Barthelia furcata Rothwell & Mapes, 2001
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genus
type species: Barthelia furcata Rothwell & Mapes, 2001
Coniferophytic seed plants with compound ovulate fertile zones and simple pollen cones; branched, woody stems bearing closely spaced simple and forked leaves. Stems eustelic with enarch primary xylem, dense wood; leaves vascularized by single bundle, stomata in two adaxial bands, guard cells with papillate subsidiary cells; stomatoliferous grooves absent. Pollen cones simple, pollen sacs borne adaxially on sporophylls, producing monosaccate, eusaccate prepollen.
Voltzialean plants with ovulate pre-cones comprising a 'compount cone-like fertile zone of axillary dwarf shoots' extending into a distal 'vegetative zone'; ovuliferous 'dwarf shoots' radial, with 'numerous sterile scales', and in the 'axils of helically' arranged bracts with forkedtips; ovules 'apparently erect', 'borne on narrow sporophylls' (adapted from Rothwell & Mapes 2001)