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Subfamilies Podostemoideae and Tristichoideae of the aquatic flowering plant family Podostemaceae are conventionally characterized by a different mode of microsporogenesis. Simultaneous meiotic division into the four microspores is found in Tristichoideae, successive meiotic division is said to be typical of Podostemoideae. In contrast, the results of the present study reveal that in subfamily Podostemoideae...
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