The genus Fuscoporia of the Hymenochaetaceae is characterized by resupinate to pileate basidiocarps, a dimitic hyphal system with fine crystal aggregates and encrusted generative hyphae in dissepiment edge and tube trama, the presence of hymenial setae, and hyaline, thin-walled, smooth basidiospores. Members of the F. contigua group are easy to distinguish from other species of Fuscoporia because of the moderately large pores, presence of mycelial setae, and large hymenial setae. Here, we explore phylogenetic relationships among 20 species of Fuscoporia based on examination of some 90 collections sampled worldwide. Seven new species are recognized in the F. contigua group-F. americana, F. centroamericana, F. costaricana, F. latispora, F. monticola, F. septiseta, and F. sinica-described from China, Costa Rica, Mexico, and the United States. Phylogenetic analyses inferred from DNA sequences of the nuc rDNA internal transcribed spacer (ITS1-5.8S-ITS2 = ITS), D1-D2 domains of nuc 28S rDNA (28S), and translation elongation factor EF-1 alpha (tef1) support the F. contigua group as one of two major clades within Fuscoporia comprising nine species worldwide.

b Institute of Microbiology PO Box 61 Beijing Forestry University Beijing 100083 China

Beijing Advanced Innovation Center for Tree Breeding by Molecular Design Beijing Forestry University Beijing 100083 China

c Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110164 China

e Biology Centre of the Academy of Sciences of the Czech Republic Branišovská 31 CZ 370 05 České Budějovice Czech Republic

Shandong Provincial Key Laboratory of Applied Mycology Qingdao Agricultural University Qingdao 266109 China

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Taxonomic and phylogenetic contributions to Fuscoporia (Hymenochaetales, Basidiomycota): two new species from Hawaii with a key to North American species