Pore field

An area of fine pores, or perforations, through the diatom valve. It is the site of the extrusion of mucopolysaccarides for making stalks and pads.

Apical Pf
Image Credit: Sarah Spaulding
External view of the apical porefield of Didymosphenia geminata.
Apical Porefield
Image Credit: Marina Potapova
Internal view of the apical porefield of Cymbella affinis.
Eldorado Comp
Image Credit: Sarah Spaulding
Live cell of Didymosphenia geminata with mucopolysaccaride stalk (at bottom of image) secreted from the apical porefield. The stalk is covered with cells of Achnanthidium minutissimum.