Buttonwood

Some wood-cells from Buttonwood, Platanus, a whole cell and lower end of another on the left; a cell cut half away lengthwise, and half of another on the right; some pores or pits (a) seen on the left; while b b mark sections through these on the cut surface. When lving and young the protoplasm extends into these and by minuter perforations connects across them. In age the pits become open passages, facilitating the passage of sap and air.

Downloads