Pollen wall structure in Anigozanthos viridis (Haemodoraceae)

Abstract

The exine of Anigozanthos viridis Endl. pollen is divided into two zones by a plane which has been referred to as a"commissural line"; in our results we refer to it as a junction plane - a more apt description. Following young stages there is a pronounced reduction in thickness of the inner exine, probably due to stretching of the exine without the addition of new material as development progresses. We describe the fibrillar zone under the exine in microspores as oncus-like. Since this onciform zone precedes microspore mitosis and intine formation the fibrillar zone is divided into two layers in mature pollen an onciform part and the intine proper - it is not a two layered intine.

Keywords

• pollen, exine
• "commissural line"
• junction plane
• Anigozanthos
• Haemodoraceae