The pinnate fronds are characterised by a broad rachis bearing sessile broadly linear pinnules rounded at the base, obtusely pointed at the apex, reaching a length of 15–20 cm. and a breadth of 12–35 mm. From a well-marked midrib are given off secondary veins dichotomously branched close to their origin. The linear synangia near the ends of the veins contain two rows of sporangial compartments and open as two valves as in _Marattia_. (Cf. fig. 245, A, p. 320.) [Sidenote: DANAEOPSIS] This species occurs in the Rhaetic beds of Scania, Franconia, and Tonkin. A similar type is figured by Fontaine from Jurassic beds in California as _Angiopteridium californicum_[1034], and Bartholin[1035] and Moeller[1036] record _M. Muensteri_ from the Lias of Bornholm. Schenk’s species from China[1037], _Angiopteris Richthofeni_, is a closely allied species, and a similar form is recorded from Jurassic and Caucasian strata[1038]. The microscopical examination by Nathorst[1039] of a group of spores from a synangium of _M. Muensteri_ shows that they resemble those of recent Marattiaceae. • • • • • From the Upper Triassic plant beds of Lunz, Stur has included several species of ferns in the Marattiaceae, and of these Krasser[1040] has recently published full diagnoses but unfortunately without illustrations. In addition to _Marattiopsis marantacea_ (Presl) the list includes species referred to _Coniopteris_, to _Speirocarpus_, a genus founded by Stur, to _Oligocarpia_, _Asterotheca_, and _Bernouillia_ (Heer). As already pointed out, some at least of these Austrian ferns are more probably Osmundaceous than Marattiaceous. _Danaeopsis Hughesi_, Feistmantel. The pinnate fronds described by Feistmantel[1041] from the Middle Gondwana rocks of India and recorded from Rhaetic strata in South Africa[1042], China[1043], and Tonkin[1044], may belong to a member of the Marattiaceae, but no fertile specimens have been described. The close agreement between the sterile leaves from India and South Africa and the fertile fronds of _Marattiopsis marantacea_ suggests generic identity. The Upper Triassic ferns described by Heer, Krasser[1045], and Leuthardt[1046] as _Bernouillia_ have been referred to the Marattiaceae, but without trustworthy evidence in favour of this affinity. The large leaves, 70 cm. long and 7 cm. broad, described by Zigno[1047] from the Jurassic of Italy as _Danaeites Heeri_, are probably Cycadean. The Polish Jurassic species _Danaea microphylla_[1048] is a more satisfactory record. [Illustration: FIG. 294. A, B. _Nathorstia angustifolia_, Heer. (After Heer. A, nat. size.) C, D. Sorus of _N. latifolia_, Nath. (After Nathorst. C, × 12; D, × 45.)] _Nathorstia._