| belgium | | isothecium alopecuroides | species | 2 | 0 |
| belgium | | isothecium myosuroides | species | 2 | 0 |
| canada | | isothecium cristatum | species | 2 | 0 |
| china | | isothecium subdiversiforme | species | 2 | 0 |
| france | | isothecium alopecuroides | species | 8 | 0 |
| georgia | | isothecium alopecuroides | species | 2 | 0 |
| germany | | isothecium alopecuroides | species | 9 | 0 |
| germany | saxony-anhalt | isothecium holtii | species | 3 | 0 |
| ireland | | isothecium alopecuroides | species | 2 | 0 |
| ireland | | isothecium holtii | species | 2 | 0 |
| ireland | | isothecium myosuroides var. brachythecioides | varietas | 2 | 0 |
| japan | | isothecium subdiversiforme | species | 3 | 0 |
| morocco | | isothecium alopecuroides | species | 24 | 0 |
| morocco | | isothecium myosuroides | species | 2 | 0 |
| norway | | isothecium alopecuroides | species | 16 | 0 |
| norway | | isothecium holtii | species | 2 | 0 |
| norway | | isothecium myosuroides | species | 2 | 0 |
| norway | | isothecium myosuroides var. brachythecioides | varietas | 2 | 0 |
| poland | | isothecium alopecuroides | species | 7 | 0 |
| portugal | | isothecium algarvicum | species | 4 | 0 |
| spain | | isothecium alopecuroides | species | 15 | 0 |
| spain | | isothecium myosuroides | species | 4 | 0 |
| sweden | | isothecium alopecuroides | species | 23 | 0 |
| switzerland | | isothecium alopecuroides | species | 4 | 0 |
| ukraine | | isothecium alopecuroides | species | 2 | 0 |
| united kingdom | | isothecium alopecuroides | species | 8 | 0 |
| united kingdom | | isothecium holtii | species | 2 | 0 |
| united kingdom | northern ireland | isothecium holtii | species | 1 | 0 |
| united kingdom | scotland | isothecium myosuroides | species | 1 | 0 |
| united kingdom | scotland | isothecium myosuroides var. brachythecioides | varietas | 4 | 0 |
| united kingdom | wales | isothecium holtii | species | 1 | 0 |
| united kingdom | wales | isothecium myosuroides | species | 1 | 0 |
| united states | | isothecium myosuroides | species | 2 | 0 |
| united states | | isothecium stoloniferum | species | 3 | 0 |