| Clue | Source | Date |
|---|---|---|
| Organic woodland layer | Thomas Joseph | 17 Dec 2019 |
| Place for ferns and pine needles | ||
| Place for ferns and pine needles | New York Times | 07 Oct 2019 |
| Area covered with decomposing leaves and branches | USA Today | 24 Nov 2016 |
| Area covered with decomposing leaves and branches |