haplocheilic stomata

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Lab VIII - Medullosans and Cycads (3)
... non-bifurcating leaf-base also represent derived characters shared between Taeniopteris and cycads. Haplocheilic stomata occur in several other types of seed plants, for example conifers, ginkgoes, Ephedra, ... lamina. What might be the roles of this reinforced structure? Figure 8.6: Haplocheilic stomata in cycads. During the Permian fossil genera with greater resemblance to living cycads ...
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