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《Acta Palaeontologica Sinica》 1977-02
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ON THE NEW GENERA OF ANNULARIA-LIKE PLANTS FROM THE UPPER TRIASSIC IN SICHUAN-SHANXI AREA

Wang Xifu (Kansu Institute of Petroleum Geology)  
The discovery of Annularia-like fossils in Triassic deposits is of special interestfrom the phylogenetic point of view.Two new genera,Neoannularia and Neostachya,are proposed for the whorled leaf-bearing stems and cones respectively.Genus Neoannularia gen.nov.Diagnosis:Shoot articulate,covered with fine ribs.Lateral branches pinnate,given off at an acute angle.Leaves verticillate;leaf-whorl spreading out in one plane,oblique to the axis.Leaves of each whorl numbering about 20 ip the main branchesand 10—16 in the lateral branches.Leaves equal in length or a little longer in theupper,lanceolate to linear-oblanceolate in shape,straight or somewhat faleate,acute oracuminate at the apex,but slightly coherent at the basal part.Genus Neostachya gen.nov.Diagnosis:Fertile shoot articulate.Cone almost sessile,given off at an acuteangle from the node,pinnately arranged.Axis rather thick,tapering gradually to theextremities.Bracts of each whorl united for the greater part of their length into acontinuous disc,the free tips abruptly bending upwards below the next higher whorl.Sporangium and sporangiophore unknown.The present new genera,Neoannularia and Neostachya,stand nearest to thePalaeozoic Annularia and Palaeostachya respectively.Accordingly,it seems appropriateto place them in the family Calamitaceae rather than Equisetaceae.
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