| Plant | Low PPM | High PPM | StdDev | *Reference | |
|---|---|---|---|---|---|
| Juniperus virginiana | Leaf | -- | -- | * | |
| Lycopodium selago | Plant | -- | -- | * | |
| Thuja occidentalis | Leaf | -- | -- | * | |
| Pinus sylvestris | Leaf | -- | -- | * | |
| Juniperus communis | Leaf | -- | -- | * | |
| Equisetum arvense | Plant | -- | 1.82 | * | |
| Taxus baccata | Fruit | -- | -- | * | |
| Pinus strobus | Leaf | -- | -- | * |