ABSTRACT
Two Nostoc-like strains have been isolated, purified, cultured and identified on the basis of the polyphasic approach using morphological, ecological, molecular and phylogenetic methods. Both strains were found to have morphology similar to the genus Nostoc, but clustered strongly in a group distant from the Nostocsensu stricto clade. Further analysis, using the folded structures of the 16S-23S ITS region revealed strong differences from closely related members of the genus Nostoc. Distinct phylogenetic clustering and strong tree topologies using Bayesian inference, maximum-likelihood and maximum-parsimony methods indicated the need to revisit the taxonomy of the members of this particular clade with a clear need for giving a generic status distinct from the genus Nostoc. In accordance with the International Code of Nomenclature for Algae, Fungi and Plants, the name Desikacharya gen. nov. is proposed for the new genus along with the description of two new species, Desikacharya nostocoides sp. nov. and Desikacharya soli sp. nov., and reclassification of Nostoc thermotolerans to Desikacharya thermotolerans comb. nov.
