Researchers studied fungal infections in Dutch cystic fibrosis patients and discovered a surprising variety of Penicillium and Talaromyces species living in their lungs. They identified 75 different fungal species total, including a previously unknown species named Penicillium subluteum. The study emphasizes that these fungi should no longer be dismissed as harmless contaminants, as they may play important roles in lung disease and need to be accurately identified for proper patient management.