increase in pollen aperture number, suggesting that pollen apertures are under strong selection pressure. This trend can be observed by comparing the aperture patterns in basal angiosperms (including monocots) with those of eudicots. Different developmental strate-gies operate for pollen apertures in basal angiosperms
Reuse your fountain pen by refilling the ink. Use the method that is suitable for your type of pen. 1  Fill ink in a piston converter pen by removing the cap and barrel and then dipping the nib inside the ink bottle. 2  Lower the piston to remove the air inside. 3  When you pull up the piston, the ink will be sucked in.
I prefer a pen that is more economical, yet still writes well. This puts us in the camp of disposable pens. Among disposable pens, there are three main kinds of ink types to choose from: dry ink, gel, and roller ball. Dry ink pens easily skip. Ballpoint pens are dry ink. The best example of the dry ink pen is Bic. The purpose of a dry ink pen is not to provide a good writing experience, but rather to be cheap. Because they use less ink, they last longer. But because they use less ink, they also donât write as smoothly and tend to skip. Gel pens write more smoothly.