From Upper Triassic beds of Virginia, Fontaine has figured several fronds for which he instituted the genus _Mertensides_[854]. The habit, as he points out, is not dichotomous, but the sori are circular and are said to be composed in some species of four to six sporangia. No satisfactory evidence is brought forward in support of the use of a designation implying a close relationship with recent Gleichenias (sect. _Mertensia_). One of the species described by Fontaine was originally named by Bunbury _Pecopteris bullatus_[855], the imperfect type-specimen of which is now in the Museum of the Cambridge Botany School. In the form of the frond, the thick rachis, and in the pinnules this Triassic species resembles _Todites Williamsoni_, but the resemblance does not extend to the sori. Two of Fontaine’s species are recorded by Stur from Austria[856], but he places them in the genus _Oligocarpia_ and includes them in the Marattiaceae. Leuthardt[857] figures what appears to be a Gleicheniaceous fern from the Upper Triassic beds of Basel as _Gleichenites gracilis_ (Heer) showing sori composed of five sporangia (fig. 265, C) with a horizontal annulus. A Rhaetic species _Gleichenites microphyllus_ Schenk[858] from Franconia agrees in the form of its small rounded pinnules with _Gleichenia_, but no sporangia have so far been found. An impression of a frond from Jurassic rocks of northern Italy figured by Zigno as _Gleichenites elegans_[859] closely resembles in habit recent species of _Gleichenia_; though no sporangia have been found, the habit of the frond gives probability to Zigno’s determination. A Jurassic species from Poland, _Gleichenites Rostafinskii_, referred by Raciborski[860] to _Gleichenia_, exhibits a close agreement in habit and in the form of the soral impressions to some recent species of _Gleichenia_.