Filamentous fungi, commonly known as molds, can be grown into small spherical structures called pellets that act as excellent platforms for attaching and growing various types of cells. These fungal pellets are sustainable, biodegradable alternatives to synthetic materials and can support different cell types for applications ranging from producing cultivated meat to treating wastewater. The porous structure of fungal pellets allows cells to attach and grow while maintaining the ability to transfer nutrients and oxygen efficiently.