Talk about Leucoplast.

Enlarged proplastids found in internal tissues as well as epidermis, amyloplast is an example abundant in storing tissues such as roots and play a role in gravity detection (growth direction) almost destroyed by accumelation of large starch granules. Outer membranes is the only remained element that delimits the stroma which contains several starch granules composed of concentric layers of starch, even outer membrane could rupture when granules become bigger such as in potato tuber.