Paracorymbiglomus gen. nov., Diversispora conica sp. nov., and new combinations in Diversisporaceae (Glomeromycota)

The paper presents the results of morphological studies, as well as comparisons and phylogenetic analyses of sequences of the 45S (= 18S-ITS-28S) nuc rDNA region and the <i>rpb1</i> gene (when available) of four arbuscular mycorrhizal fungi (AMF) of the phylum Glomeromycota. These fungi were (i) an informally named isolate 449, suspected of being an undescribed species of the genus <i>Diversispora</i>, and (ii) three <i>Corymbiglomus</i> species in the family Diversisporaceae. The studies confirmed the novelty of isolate 449 in <i>Diversispora</i> and showed that <i>Corymbiglomus</i> contains only <i>C.corymbiforme</i>, while <i>C.globiferum</i> and <i>C.pacificum</i> should be transferred to a separate genus sister to <i>Corymbiglomus</i>. Consequently, isolate 449 was described as <i>Diversisporaconica</i> <b>sp. nov.</b>, <i>C.globiferum</i>, and <i>C.pacificum</i> were placed in <i>Paracorymbiglomus</i> <b>gen. nov.</b> and renamed <i>P.globiferum</i> <b>comb. nov.</b> and <i>P.pacificum</i> <b>comb. nov.</b>