Compatible haploid hyphae fuse to produce a dikaryotic mycelium. Sclerotia germinate to produce additional hyphae and asexual spores call conidia. Fungi causing ringworm infections produce septate (segmented) hyphae. Aerial hyphae of fungi produce asexual reproductive spores. The germ tubes will grow to form the hyphae and fungal mycelia. The sporangiospores germinate to form the haploid hyphae of a new mycelium. The network of these tubular branching hyphae, called a mycelium, is considered a single organism. These two are some of the specialized hyphae that are formed by fungal conidia. These growth processes lead to the development of a mycelium, an interconnected network of hyphae. Dermatophytes known to cause athlete's foot will demonstrate multiple septate branching hyphae on microscopy. Hence the bifurcating fungal hyphae can form true reticulating networks. In the environment it is found growing as filamentous hyphae. Species nomenclature are usually based on their color of hyphae and spores. The thallus is made up of filaments of the fungus called "hyphae". Some show the presence of spores formed directly from the hyphae (arthroconidia).