| canada | british columbia | heterobasidion occidentale | species | 50 | 0 |
| united states | | heterobasidion occidentale | species | 34 | 0 |
| united states | california | heterobasidion occidentale | species | 6 | 0 |
| united states | colorado | heterobasidion occidentale | species | 13 | 0 |
| united states | oregon | heterobasidion occidentale | species | 6 | 0 |
| united states | washington | heterobasidion occidentale | species | 8 | 0 |