Third and final developmental stage of stone cells: "3, The walls are completed. The primary wall is black, cellulose additions white, and the lignified walls in 3 are stippled. Notice that the protoplasts have disappeared in 3, and the pits in some instances are branched." -Stevens, 1916

Stone Cells 3

Third and final developmental stage of stone cells: "3, The walls are completed. The primary wall is…