What is a mass of hyphae known as?

A mass of hyphae is known as mycelium. Mycelium is a fundamental structure of fungi, consisting of a network of thread-like structures called hyphae. These hyphae grow and branch out, forming a dense, intertwined network that plays a crucial role in nutrient absorption and decomposition within the ecosystem. Mycelium is essential for the growth and development of fungal organisms, as it allows them to expand their reach in search of food sources.

The other options do not accurately describe a mass of hyphae. A rhizome refers to a type of underground stem that produces roots and shoots, it's not related to fungi. A spore is a reproductive unit of fungi, which is far different from the network of hyphae that constitutes mycelium. A filament is simply a thin, thread-like structure and does not specifically refer to the mass formed by multiple hyphae. Understanding the distinction between these terms is important for grasping the life cycle and structural organization of fungi.