vasicentric parenchyma --- parenchyma cells that form a complete circle around and touching the pores

"vasi" means "vessel" and one of the meanings of centric is "concentrated around", so this is a good descriptive term for parenchyma cells that are all around a pore, with the pore at the center. Vasicentric cells, when they exist around the pores in a given wood, range from very tiny to fairly large and their groupings range from quite fat (lots of cells) to very few, and "scant" which means not even totally surrounding the pore.

Examples of vasicentric parenchyma

 
fat vasicentric parenchyma (the wood is albizia)


 
fat vasicentric parenchyma (the wood is tambran)


 
lozenge shaped aliform parenchyma (a special sub-form of vasicentric parenchyma)
with large parenchyma cells (the wood is sucupira)


 
thin (almost "scant") vasicentric parenchyma with small parenchyma cells
(the wood is meranti)


 
sparse vasicentric parenchyma with large parenchyma cells
(the wood is peroba rosa)