Abstract
Observations of epidermal cells from the root meristem of Pisum sativum reveal the presence of crystalline structures within the mitochondrial matrix. The crystals are rectangular in shape and measure 0.2–0.4 μ across their widths and lengths. A crystalline lattice is formed by the appearance of regular alternating dense and light bands with a repeat of approximately 55 A. Each dense line and light interspace measures 25–30 A in width. The appearance of these intramitochondrial crystals are compared with those reported for intramitochondrial inclusions in both normal and pathologic animal tissues in addition to several similar crystalline structures that occur in other cellular organelles.
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