TCS haplotype networks based on non-recombining ITS sequences. a. C. arcuatorum. b. C. aureofulvus. c. C. elegantior. d. C. napus. Parsimony probabilities were set at 95%. Sizes of circular and rectangular areas are proportional to the number of individuals with that haplotype. Haplotypes with a blue background are from the Old World and those with red backgrounds are from the New World. Haplotypes comprising New and Old World populations are indicated by lilac backgrounds. Distributions of ecological and morphological features are abbreviated as follows: F, Fagaceae; P*, Pinaceae (pure stand in Wyoming); P, Pinaceae; B, Betulaceae, M1, populations of C. arcuatorum with larger spores; M2, some populations of C. elegantior with sulphur yellow veil and lacking of veil patches on the pileus surface.