Abstract
Abstract. The chloroplasts of two species of the Crassulaceae and their F1 hybrid were compared by electron microscopy. The two species had contrasting leaf tissue δ13C values of −25°/∞ (Sedum greggii) and −13°/∞ (Cremnophila linguifolia), and the F1 hybrid had a value of − 18°/∞. S. greggii had a mean of 8.9 thylakoids per granum in contrast to C. linguifolia which had a mean of only 3.8 thylakoids per granum. The F1 hybrid had a mean of 6.4 thylakoids per granum. Crystaloids were observed in S. greggii and the hybrid but not in C. linguifolia
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