| albania | | ferrissia fragilis | species | 1 | 0 |
| brazil | minas gerais | ferrissia sp. bold:aae6642 | species | 6 | 0 |
| brazil | rio de janeiro | ferrissia sp. bold:aae6642 | species | 6 | 0 |
| canada | nova scotia | ferrissia rivularis | species | 1 | 0 |
| canada | saskatchewan | ferrissia rivularis | species | 2 | 0 |
| france | | ferrissia fragilis | species | 1 | 0 |
| greece | epirus region | ferrissia fragilis | species | 1 | 0 |
| greece | west greece region | ferrissia fragilis | species | 1 | 0 |
| japan | aomori prefecture | ferrissia californica | species | 11 | 0 |
| japan | kagoshima prefecture | ferrissia californica | species | 10 | 0 |
| japan | kanagawa prefecture | ferrissia californica | species | 2 | 0 |
| japan | miyagi ken prefecture | ferrissia californica | species | 6 | 0 |
| japan | nagano prefecture | ferrissia californica | species | 10 | 0 |
| japan | okayama prefecture | ferrissia californica | species | 7 | 0 |
| japan | okinawa prefecture | ferrissia californica | species | 11 | 0 |
| japan | osaka prefecture | ferrissia californica | species | 2 | 0 |
| japan | shiga prefecture | ferrissia californica | species | 17 | 0 |
| japan | shizuoka prefecture | ferrissia californica | species | 5 | 0 |
| japan | tokyo prefecture | ferrissia californica | species | 7 | 0 |
| japan | yamagata prefecture | ferrissia californica | species | 11 | 0 |
| japan | yamaguchi prefecture | ferrissia californica | species | 3 | 0 |
| montserrat | | ferrissia californica | species | 2 | 0 |
| myanmar | tanintharyi division | ferrissia fragilis | species | 1 | 0 |
| philippines | | ferrissia fragilis | species | 2 | 0 |
| poland | | ferrissia fragilis | species | 3 | 0 |
| portugal | acores autonomous region | ferrissia fragilis | species | 1 | 0 |
| taiwan | | ferrissia fragilis | species | 2 | 0 |
| uganda | | ferrissia cf. clessiniana aj-2004 | species | 2 | 0 |
| united states | | ferrissia sp. mdjkkml-usa | species | 2 | 0 |
| united states | california | ferrissia fragilis | species | 3 | 0 |
| united states | iowa | ferrissia rivularis | species | 1 | 0 |
| united states | maryland | ferrissia rivularis | species | 7 | 0 |
| united states | oregon | ferrissia californica | species | 1 | 0 |