What is the term for partly decomposed organic material found on a forest floor?

The term for partly decomposed organic material found on a forest floor is known as ground duff. This layer consists of organic matter, such as fallen leaves, twigs, and other plant materials that have started to break down but are not fully decomposed. Ground duff plays a crucial role in the ecosystem as it helps retain moisture, provides habitat for various organisms, and contributes to soil formation and nutrient cycling.

Understanding ground duff is essential because it serves as a natural mulch that protects the soil and supports the growth of vegetation in a forest environment. It can be distinguished from other options, such as forest litter, which typically refers to fresh organic materials still on the surface, while wood chips and leaf mulch are often human-made or deliberately placed materials, rather than naturally occurring layers of decomposition.