Scientia Sinica

152 SCIENTIA SINICA Vol, V Te UN tee

The composition of the Upper Triassic or Rhaetic flora of the Molteno beds, South Africa’! is somewhat different from that of the Yenchang flora. There are only two species in common, Le. Neocalamites carreret Zeiller and Ginkgoites magnifolia (Fontaine). Other closely comparable forms may be mentioned: C/. (Todites) roesserti, Cl. (Todites) goeppertiana and Cl. nebbensis. The first two forms may be compared with our Cl. shensiensis, and the last one recalls more or less our Cl. ichiinensis. The specimen described as Stenopteris elongata is also more or less comparable to one of ours described under the name of ?Sphenobatera furcata. It is interesting to note that in the Molteno beds of South Africa, there are also four or five species of Thinnfeldia, but most of the specimens might belong to the genus Dicrodium in the sense of Prof. Gothan.

Our Yenchang flora seems, moreover, to have some species in common with the Scoresby Sound flora in Eastern Greenland. They are Equisetites sarrani, Neocalamites carcinoides, Swedenborgia cryptomerioides, etc. It is striking that all these forms are found in the Lower Jurassic Thaumatopteris zone in Eastern Greenland, and only S. cryptomertoides is obtainable also in the Lepidopteris zone, or in the transitional beds between the Lepidopteris zone and the Thaumatopteris zone. Other related or closely comparable forms between the Yenchang and Scoresby Sound floras are Neocalamites hoerensis, Todites goeppertianus, Drepanozamites nilssoni, etc. Only T. goeppertianus is found in the transitional beds between the Lepidopteris. zone and T haumatopteris zone, while the other two forms are confined to the Lepidopteris zone. N. hoerensis is all but indistinguishable from our N. carreret; Todites goeppertianus is a closely related species of Cl. ( Todites) shensiensis; Drepanozamites nilssoni is somewhat distinct from D.? p’ani from the Yenchang Formation, because the latter has a more or less distinct midrib in the segments. There are many Podozamites forms in the Scoresby Sound flora, most of which are found in the Lepidopteris zone. The majority of these forms belong to the type of Podozamites lanceolatus and are closely comparable to the specimens found in the Yenchang Formation. In conclusion, the composition of the Yenchang flora is not exactly comparable to that of the Scoresby Sound flora. It is, however, highly probable that the uppermost part of the Yenchang Formation corresponds to the Lepidopteris zone of Eastern Greenland.

There are some common species, too, between the Yenchang flora and the Mesozoic floras in Sweden”? 4!, All these forms seem to occur in the higher horizon, ic. Lower Jurassic in Sweden. They are Neocalamites carcinoides (found from Scania), Thinnfeldia nordenskioldi (known in Palsjor), Swedenborgia cryptomerioides (known in Hor and Palsjor), Danaeopsis fecunda (known in Scania)", etc. Other closely related forms may also be mentioned, e.g. Neocalamites hoerensis, Todites goeppertianus, Drepanozamites nilssoni, the species of Sagenopteris, Phlebopterss and