Depending upon the number of pores present in Vessel element perforation plate they are known as the simple or multiple perforation plate. In the case of simple perforation plate there is only one single large pore. Whereas in the multiple perforation plate there are number of pores present on the perforation plate which are arranged in different ways. When the pores are arranged in a reticulate manner it is called as the reticulate type. If the pores are arranged in parallel series, it is called as the scalariform type. If the perforations are grouped together then it is known as the foraminate type.
