Place
- Africa6
- Alameda County (Calif.)18
- Albion River Watershed (Calif.)4
- Asia6
- Australasia6
- California9
- California, Northern34
- Central America6
- Contra Costa County (Calif.)19
- Europe6
- Freshwater Creek (Calif.)10
- Humboldt County (Calif.)28
- Jackson Demonstration State Forest (Calif.)1
- Kenya1
- Marin County (Calif.)18
- Mendocino County (Calif.)5
- Menlo Park (Calif.)1
- Monterey County (Calif.)1
- Napa County (Calif.)18
- North America6