Morphological characteristics of Monascus

The mycelium of Monascus, commonly known as purple monascus, exhibits an abundance of branches. Initially colorless, these branches gradually transition into a lovely shade of red, and as they age, they take on a purplish-red hue. The septal mycelium appears multinucleated and contains orange-red particles. As the mycelium matures, it produces solitary or clustered conidia at the apex of its branches. The conidia themselves are brown in color, measuring around (6-9)μm in width and (7-10)μm in length. Additionally, the other hyphae develop orange-red spherical ascus shells, also known as closed shells, on their upper ends. These closed shells possess an orange-red hue and display a near-spherical shape, with a diameter ranging from 25-75μm. Each closed shell contains multiple asci, which are spherical structures enclosing eight ascospores. Following maturation, the asci walls disintegrate, leaving behind the ovoid or nearly spherical ascospores. These ascospores are transparent, smooth, and can be either colorless or lightly tinted red, with dimensions of (5.5-6)μm in width and (3.5-5)μm in length.