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.
1 Quick-drying ink for smudge-free writing. 2  Each felt pen features a click-seal cap with clip to minimize dry-out. 3  Point Guard tip reduces fraying. 4  Paper Mate Flair porous-point black-ink pens come in a pack of 12.  1.0 mm tips allow these Paper Mate black-ink pens to create medium-width marks.