Atomic-force microscopic and X-ray techniques were applied to reveal and analyze uniquely three types of distinctly different crystals including a Janus-face composite type of spherulites in LMw-PLLA induced by mixing with aPMMA 20 wt . One type Type-1 is completely packed by fibrous lamellae while the second type Type-2 is completely packed by flat-on platelet crystals and the third type a dual-faced i.e. Janus-faced Type-3 spherulite with two distinguished patterns filling the composite spherulites perpendicular quadrants that is originated from sheaf-like directional growth from nuclei to pack into fibrous lamellae while the perpendicular growth was diffusion-drained leading to thinner flat-on platelets. The Janus-face spherulite type half-and-half fibrous lamellae and flat-on platelets became more significant only when the 8020 mixtures were melt-crystallized at Tc 110115 C. That is existence of Type-3 Janus-faced spherulite is composition- and temperature-selective for favorable nucleation and growth. Mechanisms leading to such diversified patterns and Janus-face spherulites in the LMw-PLLAaPMMA blend were probed.