Archive image from page 75 of The developmental anatomy of Isoetes. The developmental anatomy of Isoetes . developmentalana31paol Year: 1963 Orth. -I Y-Axis Orth. I Orth. -2 Figs. 17 and 18. Transverse sections in the same series as figures 15 and 16, at higher levels in the plant. X 80. Fig. 17. A level near the basal meristem. The traces are crowded. The series no longer converge with the x-axis. Fig. 18. At the level of the recent derivatives of the basal meristem. All of the primordia within the youngest series are recorded within the limits of orthos- tichies —2 and 2. The series dive

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Archive image from page 75 of The developmental anatomy of Isoetes. The developmental anatomy of Isoetes . developmentalana31paol Year: 1963 Orth. -I Y-Axis Orth. I Orth. -2 Figs. 17 and 18. Transverse sections in the same series as figures 15 and 16, at higher levels in the plant. X 80. Fig. 17. A level near the basal meristem. The traces are crowded. The series no longer converge with the x-axis. Fig. 18. At the level of the recent derivatives of the basal meristem. All of the primordia within the youngest series are recorded within the limits of orthos- tichies —2 and 2. The series diverge from the x-axis.

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