Acidomyces

In a study on the diversity of acidotolerant and acidophilic fungi in Vietnam, from plant residues and tissues, 38 strains of Acidomyces were obtained using selective isolation on MEA containing 1 % sulfuric acid. Identification by ITS sequencing indicated that 23 strains belong to A. acidothermus and five strains to A. acidophilus. Two novel Acidomyces species were found and assigned as A. paludis (two strains) and A. ducanhii (eight strains). Acidomyces ducanhii differs from A. paludis by 12/513 (2 %) positions in ITS, 4/1 322 (0 %) in LSU, 39/980 (4 %) in tef1, and 54/1 062 (5 %) in rpb2. Both species are acidophilic but differ from each other in the level of acid tolerance, micromorphology, and culture morphology. Acidomyces ducanhii has the slowest growth rate and least level of acid tolerance among Acidomyces spp.