Abstract
In this report, we describe three novel asexual basidiomycetous yeast species, Cryptococcus aciditolerans sp. nov. (type strain CBS 10872T=SDY 081T), Cryptococcus ibericus sp. nov. (type strain CBS 10871T=SDY 022T) and Cryptococcus metallitolerans sp. nov. (type strain CBS 10873T=SDY 190T), which were isolated from acid rock drainage collected at the São Domingos mine in southern Portugal. Phylogenetic analysis of molecular sequence data indicated that the novel species belong to the order Filobasidiales of the class Tremellomycetes and form a well-separated clade, next to Cryptococcus gastricus and Cryptococcus gilvescens. Since the novel species also share a peculiar ecology, being able to thrive under extreme environmental conditions characterized by very low pH and high concentrations of heavy metals, we designate this combination of phylogenetic and ecological characteristics as an ecoclade.
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