Figure 3.

R. carbonica Has a Unique Cellular Organization

(A) R. carbonica (Figure 1C) is overlaid with colors representing the four major tissues found within the apex (yellow, root cap; pink, promeristem; orange, ground tissues and epidermis; and green, procambium).

(B) Line drawing of the apical portion of the R. carbonica holotype (Figure 1C) is color coded to represent the major tissue types as in (A), except the promeristem is further divided (pink, proximal promeristem; and lilac, distal columella-like promeristem).

(C) Same line drawing as in (B) (blue, Kappe complex; red, Körper complex; and gray, promeristem). Black Ts indicate T-divisions in both complexes with dashed lines showing the cell files that make the vertical stroke of the T. White dashed line marks the boundary between the Körper-Kappe complexes. Yellow Ts mark positions of anticlinal cell divisions within the central columella-like region of the promeristem.

Scale bars, 500 μm (A) and 200 μm (B and C).