Mycolicibacter hiberniae (formerly Mycobacterium hiberniae) is a species of bacteria in the phylum Actinomycetota. Etymology Hibernia, Latin for Ireland where it was first isolated. Description Polymorphic, beaded, gram-positive, nonmotile and acid-fast rods (0.9 µm × 1.2–1.5 µm). Colony characteristics Smooth and glistening colonies with rose-pink pigmentation but become rough and dry later. Colonies with unique pigment production are 1-1.5 mm in diameter. Physiology Slow growth on Löwenstein-Jensen medium and Middlebrook 7H10 agar at 37 °C (range: 22-37 °C). No growth at 42 °C. Resistant to isoniazid, rifampin, and streptomycin Sensitive to ethambutol. Differential characteristics M. hiberniae has unusual rose-pink pigmentation, which is unique in the genus Mycobacterium. Pathogenesis Not pathogenic Provokes a nonspecific skin hypersensitivity reaction to bovine tuberculin. Biosafety level 1 Type strain First isolated from true moss, sphagnum, and soil in Ireland References External links Type strain of M. hiberniae at BacDive - the Bacterial Diversity Metadatabase Acid-fast bacilli hiberniae Bacteria described in 1993