Transmission electron microscopy was adopted to study the origins of vesicular inclusions in the vacuoles of Ammopiptanthus mongolicus,which were composed of vesicles differing in size and shape.They originally occurred in cytoplasm and were later swallowed by vacuoles.They were mainly located between two chloroplasts near which cytoplasm contained abundant endoplasmic reticula.Golgi bodies and tubular plasmallemma protuberances,and continuously released vesicles.In addition,a small part of them appeared ne...