HUIA RECURVATA——A NEW PLANT FROM LOWER DEVONIAN OF SOUTHEASTERN YUNNAN,CHINA
Geng Bao-yin (Institute of Botany,Academia Sinica)
A new genus and sPecies Huia recurvata is described from the Posong- chong Formation(Siegenian)of Lower Devonian in Wenshan district,Yunnan,China. This plant possesses pseudomonopodial and dichotomous axes with terminal spikes and it sometimes has single sporangia below the branching point within the fertile regions. Sporangia with stalks are ovate,adaxially recurred and downwards and spirally arranged on the axis of the spike.Protostele is centrarch.The characteristics stated above show the new plant has close affinity to Taeniocrada decheniana,but it differes from the me- mbers of any other rhyniophytes as well as zosterophyllophytes.A new family——Taen- iocradaceae can be established and is provisionally assigned to Rhyniophytina.Evolu- tionary line of early land-plants,from Rhyniaceae to Taeniocradaceae and then to Bari- nophytaceae,is discussed in this paper.