How do Magnoliales differ from eudicotyledons in pollen structure?

The primary difference between the pollen of Magnoliales and that of eudicotyledons lies in the number and type of apertures used for germination.12

• Magnoliales: As a basal angiosperm order, Magnoliales typically produce pollen that is uniaperturate, meaning it features a single germination groove or furrow (monosulcate). While some variations exist—such as inaperturate (no apertures), biaperturate, or polyforate forms—the single-aperture type is characteristic of the group and is considered a primitive feature.1345
• Eudicotyledons: In contrast, eudicots are characterized by pollen that is fundamentally tricolpate, meaning it possesses three furrows or pores. In many core eudicots, this structure is further specialized as tricolporate, where each of the three longitudinal depressions (colpi) contains a circular pore through which the pollen tube emerges.2

This tricolpate structure is dominant in more advanced angiosperm subclasses but is almost entirely absent in the magnoliid clade and monocotyledons.5