| Comments |
P.10343 left column 2nd paragraph: "Nevertheless, major changes in stomatal size (S) and density (D) are evident in the fossil record (refs 2, 6) (Fig. 1 Table S1), but their significance as land-plant evolution progressed, in parallel with advancements in gas-exchange capacity, is not yet understood." P.10343 right column 2nd paragraph: "The 400-Myr fossil history of stomata reveals that although S and D have both varied by several orders of magnitude (Fig. 1), all reported combinations are located within the biophysical envelope defined by maximum packing of stomata on the leaf surface (i.e., the maximum number of stomata of a given size, S, that can fit within a unit area) (Fig. 1, Table S1). Indeed, combinations of S and D must lie somewhat below this upper packing limit to accommodate several developmental, physiological, and mechanical requirements for spacing of stomata (refs 5, 8)." Please see note beneath figure |