Definition: Ligninsphaeriopsis is a genus of fungi that belongs to the class Myxomycetes, and it includes various species known as lignin-sphery fungi. These organisms are characterized by their ability to synthesize lignin, which is a complex polymer composed of alpha-lactones and pyranosyls. They are often found in soil, plant tissue, and marine environments, where they play important roles in the breakdown of cellulose and other organic matter.