Chapter 1 · Biology
The Stamen and the Four-Chambered Anther
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Touch a lily and your finger turns orange. Where is that pollen made? Inside the stamen, in an anther with four chambers.
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Key points
- A stamen has a long, thin filament and an anther at the top.
- A typical anther has 2 lobes with 2 chambers each: 4 microsporangia.
- The microsporangium wall has 4 layers: epidermis, endothecium, middle layers and tapetum.
- The innermost tapetum nourishes the developing pollen grains.
- The sporogenous tissue in the centre gives rise to pollen grains.
The wall of a microsporangium, outside to inside
| Layer | Note |
|---|---|
| Epidermis | Outermost |
| Endothecium | Below the epidermis |
| Middle layers | Between endothecium and tapetum |
| Tapetum | Innermost; nourishes the pollen |
Quick quiz
3 questions. Choose an answer for each, then submit to see your score and the explanations.
