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First developmental stage of stone cells: "1, in the primary meristem condition." -Stevens, 1916

Stone Cells 1

First developmental stage of stone cells: "1, in the primary meristem condition." -Stevens, 1916

Second developmental stage of stone cells: "2, the cells have enlarged and the walls have begun to thicken and become pitted." -Stevens, 1916

Stone Cells 2

Second developmental stage of stone cells: "2, the cells have enlarged and the walls have begun to thicken…

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…