part of asexual reproduction anatomical structure development aerial mycelium formation biological_process pr fertile mycelium formation GO:0097736 aerial hyphal growth 2016-10-14T14:25:22Z The process by which hyphae grow in an upward or outward direction from the surface of the substrate; from there, propagative spores develop in or on characteristic structures that are distinctive of some fungal and bacterial species. The species that form an aerial mycelium develop conidiophores at the ends of the aerial hyphae.