The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Spiders (117 members)
- TestSupport (1 member)
- Training for Citizen Scientists (3 members)
- Trees (Exotic) (276 members)
- Trees (Native) (305 members)
- Uploaded with UploadWizard (47 members)
- Weeds (542 members)
