Phylogenetic relationships between Dipodascus tetrasporeus sp. nov. SY-277T and related species, based on nucleotide sequences of the 18S rDNA and the D1/D2 region of the 26S rDNA. Details of strain names and sequence accession numbers are given in Table 1 T1 . The ML tree was constructed as described in the text. Numbers are confidence values for nodes supported by 50 % or more (values represent posterior probabilities in a Bayesian analysis/bootstraps for maximum-likelihood analysis with 250 replicates/bootstraps for maximum-parsimony analysis with 1000 replicates). Groups 1 and 2 are as defined by Ueda-Nishimura & Mikata (2000) . Bar, 0.05 substitutions per site.