Plant Systematics and Evolution

, Volume 189, Issue 1–2, pp 15–27 | Cite as

The classification and evolution of pollen types ofPlanchonioideae (Lecythidaceae)

  • Chih-Hua Tsou
Article

Abstract

The pollen type ofPlanchonioideae is unique among the angiosperms in its syntricolpatism associated with the marginal ridge, marginal groove, and polar cushion; it has been studied byJ. Muller, who classified it into three types, mainly with a light microscope. In the present study, pollen grains of the six constitutent genera were studied with a scanning electron microscope, five additional pollen types were recognized. Of the eight pollen types the one with sealed polar ectoapertures and weakly developed marginal ridges, without marginal grooves and polar cushions is regarded as the most primitive. Evolutionary trends proceeded with the opening of the polar ectoapertures, the complication of the polar cushions and marginal grooves. In the most advanced form, the marginal ridges and marginal grooves coalesced to form two concentric rings, whereas the polar cushions were secondarily reduced.

Key words

Planchonioideae Lecythidaceae Palynology phylogeny pollen types syncolpatism 

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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • Chih-Hua Tsou
    • 1
  1. 1.Institute of BotanyAcademia SinicaNankangTaiwan, ROC

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