Table 2. Nucleotide differences and percentages of homology between the new xylose-fermenting yeasts and the type cultures of closest relatives, S. shehatae or S. stipitis.
| Species | SSU | ITS | D1/D2 LSU | RPB1 | XYL1 |
| S. insectosa T | 100% | 98% (5 n) | 100% | 94% (34 n) | 92% (44 n) |
| S. lignosus T | 100% | 98% (5 n) | 100% | 94% (37 n) | 91% (46 n) |
| S. quercinus T | 98% (27n) | 99% (1 n) | 98% (7 n) | 98% (10 n) | 96% (11 n) |
| S. virginianus T | 97% (54n) | 99% (1 n) | 99% (4 n) | 98% (10 n) | 97% (8 n) |
| S. illinoinensis T | 99% (3n) | 99% (3 n) | 100% | 95% (28 n) | 97% (15 n) |