Investigations were performed for isolation of
Actinomyces
strains from different extreme biotopes in Bulgaria. According to the morphological, physiological and chemotaxonomic data three of the strains were taxonomically identified to genus, one as a member of genus
Frankia
and two - from genus
Actinomadura
. The other ten
Actinomyces isolates belonged to genus Streptomyces and were also identified to species.