Abstract
Fossil megaspore apparatuses of Azolla pinnata R. Brown are described from the late Quaternary of Zhejiang Province, East China. They prove to be identical in gross morphology and structure with those of the herbarium specimens of the same species. An electron microscopic study shows that the sporoderm ultrastructure is essentially constant in the megaspores of A. pinnata, either fossil or living, except those of some African specimens which have been considered by some authors as either a variety of this species or a distinct species. It is believed that the sporoderm ultrastructure will be found progressively useful in the taxonomic separation of Azolla species.
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