XVI International Botanical Congess
Abstract Number: 5878
Session = Recent plant finds in Posongchong Formation (Pragian age, Early Devonian), southeastern Yunnan, China add a new dimension to the early diversification of land plants. Of the 15 genera thus far described, 11 are endemic to the area and 4 are reported previously. Some endemic forms exhibit either novel combinations of characters (centrarch protosteles and zosterophyll-like sporangia) or earlier appearance of characters than previously known (the presence of flattened, leaf-like structures). The presence of Zosterophyllum australianum, Barag-wanathia sp., and a new species of Hedeia sinica indicate some similarity to the Upper Baragwanathia Flora of Australia. These data are included in a broad analysis of biogeography, initial results suggest that is a northeastern Gondwana phytogeographic unit during the Early Devonian comprising Australia, South China and perhaps Shan Thai Blocks.
EARLY DEVONIAN PHYTOGEOGRAPHY - NEW
INFORMATION FROM THE POSONGCHONG FORMATION, SOUTHEASTERN YUNNAN, CHINA.
Shougang Hao, Patricia G. Gensel and Anne Raymond: Dept. Geol., Peking Univ., Beijing 100871, China, Dept. of Biol., Univ. of North Carolina, Chapel Hill, NC 27510, USA, Dept. Geol. and Geophy., Texas A & M Univ., College Station, Texas 77843, USA.
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