What are mycorrhizal propagules? Propagules are an average count of colony forming spores, hyphae, & root fragments per gram. Spores act as a mycorrhizal seed that will geminate in the presence of a host plant. Hyphae is the fungal body that acts as a cutting, being able to quickly colonize a root system. Why are root fragments considered a part of the propagule count? Endo mycorrhizae, also known as Arbuscular Mycorrhizal Fungi (AMF), form a symbiotic relationship within the