Table 3. Genetic distances among the ITS haplotypes for each candidate Letharia species.

Putative lineage	N (haplotypes)	Mean genetic distance	Range
All Letharia samples	376 (37/56)	0.0044±0.0042	0.0–0.0316
L. columbiana s.l.	28 (14/15)	0.0111±0.0068	0.0–0.0298
L. ‘barbata’	7 (4/4)	0.0016±0.0012	0.0–0.0037
L. gracilis	8 (3/3)	0.0014±0.0017	0.0–.0056
L. ‘lucida’	7 (3/3)	0.0062±0.0064	0.0–0.0150
L. ‘rugosa’	6 (4/5)	0.0034±0.0024	0.0–0.0074
L. ‘lupina’	280 (19/32)	0.0020±0.0017	0.0–0.0112
L. vulpina	59 (7/13)	0.0023±0.0044	0.0–0.0186

N, number of samples within each cluster (number of unique haplotypes excluding missing data/number of unique haplotypes treating missing data as a fifth character state); mean genetic distances given as the number of nucleotide substitutions per site ± standard deviation; and range of genetic distances within each putative species.