Japanese Hemlock Pinecone

Origin
Aokigahara, also known as The Sea of Trees, consists of various types of flora and fauna along with pools of porous lava which absorbs sound. This helps provide visitors with a sense of solitude hard pressed to find in a natural setting elsewhere. However because of this the forest has a historical reputation as a home to yurei (ghosts in Japanese mythology). In recent years, Aokigahara has become internationally known as one of the world's most prevalent suicide sites. To the point of a sign being constructed at the entrance urging visitors to think of their families and seek help. It is estimated that between 2002 and 2011 over six hundred people had taken their own lives within this forest's borders.

Effects
When buried will grow into a full tree that increases depression and suicide rates for at least a 2 mile radius around it.

Collection
Chopping down the tree will only intensify effect. It was discovered, after several attempts, that removing the original pine cone from the tree causes the tree to disappear. There is only one pine cone in the entire tree.