## 2 Experimental Section
### Sequence Alignment and Phylogenetic Analysis  
Raw sequences were edited using CodonCode v. 4.0.4 (CodonCode Corporation, Dedham, MA) and aligned with MAFFT v. 7 using the L-INS-i option for ITS sequences and the FFT-INS-i option for the remaining datasets [32]. Phylogenetic reconstructions were performed using maximum likelihood (ML) and Bayesian inference (BI). For ML and BI, the best-fit nucleotide substitution model was chosen using log-likelihood (_-lnL_) scores generated using jModelTest v. 2 [33,34]. For all data sets, the model that produced the highest _-lnL_ score was the general time reversible (GTR) substitution model [35]. Sequences generated in this study were combined with data from previous studies [7,9,12,36,57]. Information for these isolates is provided in Table 1. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Species \& Code**} & \multirow{2}{*}{**Host**} & \multirow{2}{*}{**State/Province**} & \multirow{2}{*}{**Country**} & \multirow{2}{*}{**Reference**} & \multicolumn{4}{c}{**GenBank Accession Nos.**} \\ \cline{5-8}  & & & & & **_Phellinus alni_ & & & \\ \hline DLL2009-140 & _Acer rubrum_ & MN & USA & This study & KU139159 & KU139211 & KU139282 & KU139331 \\ NJB2011-SM1 & _Acer rubrum_ & MA & USA & This study & KU139161 & KU139217 & KU139279 & KU139324 \\ NJB2011-SM4 & _Acer rubrum_ & MA & USA & This study & KU139163 & KU139219 & KU139284 & KU139326 \\ NJB2011-SM3 & _Acer saccharum_ & MA & USA & This study & KU139162 & KU139218 & KU139286 & KU139325 \\ FP-143638-Sp & _Almos_ sp. & ID & USA & This study & KU139167 & KU139213 & KU139280 & KU139330 \\ HHB-15085-Sp & _Almos_ sp. & AK & USA & This study & KU139160 & KU139216 & KU139285 & KU139328 \\ NJB2011-WEN2 & _Bentala leenta_ & MA & USA & This study & KU139164 & KU139220 & KU139283 & KU139327 \\ FP-125207-T & _Bentala papryifera_ & NH & USA & This study & KU139166 & KU139212 & KU139281 & KU139292 \\ FP-70831-T & _Fagus grandifolia_ & MI & USA & This study & KU139165 & KU139214 & KU139278 & KU13922 \\ NJB2011-GR3 & _Fagus grandifolia_ & MA & USA & This study & KU139168 & KU139215 & KU139287 & KU139287 \\ BRMM 714864 & _Almos incana_ & Mikkeeli, Kakirala & Finland & [12] & GQ383775 & & GQ383821 \\ BRMM 714865 & _Almos incana_ & Červeny Klästor & Slovakia & [12] & GQ383730 & & GQ383840 \\ BRMM 714891 & _Bentala sp._ & Vyborg & Russia & [12] & GQ383770 & & GQ383853 \\ MJ 51/96 & _Fagus sybivatica_ & Havlikök Brod & Czech Republic & [12] & GQ383756 & & GQ383831 \\ BRMM 714881 & _Sorbus cf. internmedia_ & Uppsala & Sweden & [12] & GQ383732 & & GQ383848 \\ TN30301 & _Bentala sp._ & n/a & Finland & [9] & AY3404040 & & & \\ TW-162 & _Laburumn anagroroides_ & n/a & Germany & [7] & & & & \\ \hline \multicolumn{8}{c}{_Phellinus arrostaplyil_} \\ \hline FP-94140-R & _Arctostaplylos manantia_ & OR & USA & This study & KU139143 & KU139250 & KU139264 & KU1139348 \\ FP-94186-R & _Arctostaplylos patula_ & CA & USA & This study & KU139145 & KU139252 & KU139266 & KU139350 \\ M-92-2 & _Arctostaplylos patula_ & OR & USA & This study & KU139144 & KU139251 & KU139265 & KU139349 \\ \multicolumn{8}{c}{_Phellinus neviagens_ s.l.} \\ \multicolumn{8}{c}{_P. bentlinus_} \\ \hline FP-105325-Sp & _Bentala alleghaniensis_ & WV & USA & This study & KU139154 & KU139239 & KU139312 & KU139369 \\ DLL2009-143 & _Bentala alleghaniensis_ & MN & USA & This study & KU139146 & KU139236 & KU139308 & KU139371 \\ DVB-Betula & _Bentala nigra_ & VA & USA & This study & KU139151 & KU139246 & KU139314 & KU139365 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Information and GenBank accession numbers for isolates of _Phellinus_ s.s..