The morphology of syndiotactic polypropylene (s-PP), containing 91% racemic pentads, isothermally crystallized from the melt has been investigated by means of light microscopy, atomic force microscopy (AFM), and small-angle X-ray scattering (SAXS). Light microscopy shows a typical needle-like structure of crystalline entities at crystallization temperatures ranging from 115 to 150 degrees C. Large bundles of lamellae and rectangular entities with single crystal character were the main morphological structures observed by AFM. These single crystal-like entities exhibit two typical fracture types; (i) transverse straight fractures with an average distance between the cracks of approximately 2 mu m, and (ii) irregular fractures which yield a small mosaic-like structure. A lamellar thickness of 10 nm and a long period of 20 nm of s-PP crystallized isothermally at 135 degrees C were obtained from the two-dimensional correlation function of SAXS measurements. This long period is in good agreement with that measured by AFM. Rare structures such as spherulites, hedrites and aggregates having a clear lateral periodicity perpendicular to the growth direction can be observed. Light microscopy of s-PP crystallized at 126 degrees C and 3.5 kbar shows mainly spherulitic growth with an irregular banding structure.