The Type of Vassel Element's Perforation Plate of Cornus controversa

Educing and observing the stem's secondary xylem of Cornus controversa revealed there are two types of perforation plates, scalarform perforation plate and simple perforation plate, and the perforation of the simple perforation plate is extended.There are 4 types of vassel elements with different types of perforation plates: both ends of the vassel element are scalarform perforation plate; one end scalarform type, the other simple type; one end two simple types, the other end scalarform type; both ends simple type.