World distribution of new and previously described species in the P. tristis group, excluding doubtful taxa. Red – P. umbrina; pink – P. tristoides; dark green – P. sciastra; pale green – P. atrofusca; dark blue – P. tristis; pale blue – P. media; orange – P. pinophila; yellow – P. rotundispora; grey – P. alobata; black – P. abundiloba; brown – P. umbrinascens; turquoise – P. alnophila; purple – P. pluriloba.