. The developmental anatomy of Isoetes. Isoetes; Botany. THE ROOT-PRODUCING MERISTEM 63 Y-Axis 0-Orth. Orth. - Orth. I Orth. -2 Orth. 2. # = Ser. I and -I 0=Ser. 2 and -2 19 Fig. 19. A portion of figure 18. The two zigzag lines (broken one connecting empty spots; solid one connecting solid spots) trace bidirectional sequences of decreasing maturation. Each sequence starts on the 0-orthostichy and in- cludes members of the pair of series most comparable in maturation. Scott and Hill (1900) represented roots in series with different lengths in their text figure 11, and their explanation that the


. The developmental anatomy of Isoetes. Isoetes; Botany. THE ROOT-PRODUCING MERISTEM 63 Y-Axis 0-Orth. Orth. - Orth. I Orth. -2 Orth. 2. # = Ser. I and -I 0=Ser. 2 and -2 19 Fig. 19. A portion of figure 18. The two zigzag lines (broken one connecting empty spots; solid one connecting solid spots) trace bidirectional sequences of decreasing maturation. Each sequence starts on the 0-orthostichy and in- cludes members of the pair of series most comparable in maturation. Scott and Hill (1900) represented roots in series with different lengths in their text figure 11, and their explanation that the youngest series drawn is shortest because it is incompletely initiated is feasible. But their figure offers no conclusive evidence because it represents only an isolated section and does not necessarily show the youngest series of primordia in the plant. Figure 20 is a graphic condensation of the data obtained from a series of transverse sections of a plant of the same size as that in figures 13 to 16. Orthostichies —2 to 2 are represented over the range of series 6 to —6. The coordinates used in this figure are rectangular abstractions of the actual spatial relationships of the roots in the original sections. All techniques of observation are the same as in the previous example. There is a greater number of series on the -j-y side of the graph than. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paolillo, Dominick J. Urbana, University of Illinois Press


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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectbotany