Abstract:After the leaves of Tillandsia usneciaes were fixed in 2.5% glutaraldehyde under strong sun light ,some globular objects were found in the chloroplast. These globular objects did not take the ordinary U-Pb double stain but they showed a cyclic change in amount following the change of sum light intensity. At 8 O′clock in the morning,only a few globular objects appeared in the chloroplast, At 10: 00 a. m.,there were several globular objects and they greatly increased at noon and gradually reduced in the afternoon,and finally disappearred at 4: 00 p. m. For detection of periodie acid-reactive complex carbohydrates with silver methenamine staining technique , the globular objects stained black. This result demonstrated that the globular objects may be polymers of intermediat products of the carbon cycle in photosynthesis and C3 compounds in malate decarboxylation.