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leptosporangiate

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Adj.1.leptosporangiate - (of ferns) having each sporangium formed from a single epidermal cell; "leptosporangiate ferns"
eusporangiate - (of ferns) having sporangia that arise from a group of epidermal cells; "eusporangiate ferns of the families Ophioglossaceae and Marattiaceae"
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The surprising results suggest that polypod ferns--a group within leptosporangiates that includes more than 80 percent of living fern species--experienced an explosion of diversification between 20 million and 50 million years after the angiosperms appeared on the botanical scene.
Genes hint that ferns proliferated in shade of flowering plants by Perkins, S. / Science News
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