Contribution to the study of morphological variance between the isolates of Aspergillus niger obtained from different localities in Slovakia

Paper is focused on the dominant Aspergillus niger Tiegh strain isolated fr om three different localities in Slovakia. Morphological differences among cultures of isolated Aspergillus niger grown in Czapek-Dox agar and glucose yeast pepton media were observed after 25 days of cultivation. The strain isolated from Gabcikovo fluvisoils revealed 100% production of black conidi al heads while the strains from Krompachy and Rudnany geographically situat ed in Spissko-Gemerske Rudohorie hits formed reduced, smaller, light brown even grey conidial heads. The heads become coloured after 39 days. Localiti es Krompachy and Rudnany are permanently under influence of heavy metals ma inly Hg and Cu.