By using the conventional microscopic technique, the ultrastructure of the nucleolar fibrillar centers of common wheat, onion, broad bean and soybean were studied. It was showed that the two types of fibrillar centers (FCs) "homogeneous" and "heterogeneous" presented in all of the root-tip meristematic cell nucleoli of the four plants. And it was more clearly in the root-tip meristematic cell nucleoli of common wheat stained by "en bloc" silver staining technique. The results demonstrated: (1) The two types of fibrillar centers are common in higher plants; (2) The silver nitrate could stain not only the active chromatins but the inactive ones.