A cyno-substituted thiophene/phenylene co-oligomer (TPCO), 5,5'-bis(4'-cyanobiphenyl-4-yl)-2,2'-bithiophene (BP2T-CN), is vapor-deposited on KCl (001) surface kept at 220 degrees C by the mask-shadowing method. Transmission electron microscopy and fluorescence microscopy reveal that the deposited BP2T-CN crystallizes in two types of morphologies: microneedles and thin film crystallites. In particular, the predominant microneedles epitaxially grow in four directions in the manner that the BP2T-CN molecules align along the [110](KCl) or [-110](KCl). X-ray diffraction patterns indicate that the BP2T-CN molecules in the microneedle lie parallel while those in the thin film crystallite obliquely stand on the KCl surface.