Plant Systematics and Evolution

, Volume 158, Issue 1, pp 23–27 | Cite as

Different origins of fragile exines within theAnnonaceae

  • Maria Waha
Article

Abstract

Besides tectate and columellate, 3-layered exine types, in theAnnonaceae, one also finds very fragile, thin exine types. Their single exine layer corresponds either to a former tectum (including infratectal layer) or a former basal layer. The interpretation of the different origin of the remaining layers is based on their different structure and position within the intine. The fact that reduced exine types are obviously not always homologous should be regarded in systematic interpretations.

Key words

Angiosperms Annonaceae Annona Duguetia Guatteria Uvaria Pollen ultrastructure fragile exines systematics of primitive angiosperms 

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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • Maria Waha
    • 1
  1. 1.Institut für BotanikUniversität WienWienAustria

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