Summary
In the present work the question of the position of the Magnoliales from the point of view of their epidermal features has been taken up. This is rather a new line of inquiry. Florin’s criteria,viz., the haplocheile and syndetocheile types of stomatal development have been made use of. According to this test the Magnoliales are seen to comprise a few synthetic forms, some possessing certain Cycadean features, the great majority the Bennetti-talean, and a few the haplocheile gymnosperm features.
The aberrant epidermal features ofEuptelea andCercidiphyllum seem to be correlated with other primitive features of Trochodendraceæ already known.
The view has again been expressed that the progenitors of the angio-sperms have to be sought for in that plexus of gymnosperms which gave rise to the Bennettitales, the syndetocheile Gnetales, the haplocheile Magnoliales and the majority of the Magnoliales(i.e., syndetocheile) along different lines of descent,the last being probably nearest related to the Bennettitales. From the point of view of epidermal studies, the Magnoliales do not represent a co-sanguinary group, but indicate a convergence.
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Communicated by Professor B, Salmi, sc.d., F.R.s.
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Rao, H.S. Cuticular studies of magnoliales. Proc. Indian Acad. Sci. 9, 99–116 (1939). https://doi.org/10.1007/BF03050541
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DOI: https://doi.org/10.1007/BF03050541