The Upper Carboniferous fronds of a delicate Sphenopteris habit, to which this name was assigned by Kidston[1023], were described by him as _Eusphenopteris tenella_ (Brongn.)[1024] and compared with Hymenophyllaceae; subsequently Kidston expressed the opinion that _Urnatopteris_ may be a Marattiaceous fern, as Williamson[1025] believed; he has since suggested that the sporangia are the microsporangia of a Pteridosperm[1026]. The sterile and fertile pinnae differ in the absence of a lamina in the latter. The sporangia (or microsporangia) are characterised by a poricidal dehiscence. The records from strata higher in the geological series than the Permian, disregarding many of doubtful value, afford ample testimony to the existence of Marattiaceae in Upper Triassic and Rhaetic floras. _Marattiopsis._ The generic name _Danaeopsis_ was applied by Heer[1027] to an Upper Triassic fern, previously described by Presl as _Taeniopteris marantacea_. A splendid specimen from the Keuper of Stuttgart is figured in Schimper’s Atlas[1028] showing the pinnate habit of the frond and the broadly linear segments, 25 cm. × 3·5 cm., bearing rows of contiguous sporangia. The large pinnules have a strong midrib giving off curved and forked lateral veins. Presl’s species may most appropriately be included in the genus _Marattiopsis_. A specimen of _M. marantacea_ described by Leuthardt[1029] as _Danaeopsis marantacea_ from the Upper Trias of Basel shows a peculiarity in the venation; the lateral veins often fork near their origin, as noticed by other authors, but each vein forks a second time near the edge of the lamina and the two arms converge, forming a series of intramarginal loops (fig. 265, B). _Marattiopsis Muensteri_ (Goepp.). Fig. 245, D, E. This widely spread Rhaetic plant affords the best example of a post-Permian species which may be accepted as an authentic record of fossil Marattiaceae. Various generic names have been used for this species; Goeppert originally described the plant as _Taeniopteris Muensteri_[1030]; Schimper[1031] proposed the name _Marattiopsis_, and Schenk[1032] substituted _Angiopteris_ on the ground that the fertile pinnules resemble that genus rather than _Marattia_. _Marattiopsis_, if interpreted as indicating a _family_ resemblance rather than special affinity to the genus _Marattia_, would seem to be the more appropriate designation. This species has been figured by several authors and in many instances with fertile pinnules; the best illustrations are those published by Zeiller[1033] in his monograph of Tonkin plants.