Abstract
Polarizing light microscope studies of sections of embryo tissues revealed the presence of birefringent druse crystals in certain protein bodies of Eucalyptus erythrocorys and E. maculata. Light and electron microscope studies show that the location, size, and structure of the protein bodies that contain druse crystals differ in these two species. These species also differ in the number of druse-containing protein bodies occurring per cell and the size and structure of the druse crystals. Energy-dispersive X-ray analysis, acid solubility, and microincineration tests showed that these druse crystals are composed of calcium oxalate. In both species the druse crystals were retained by the seedling during germination and early seedling growth. Seeds of both Eucalyptus species also contain globoid crystals in most, nonprotodermal protein bodies.
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