Asexual reproduction occurs via vegetative spores (conidia) or through mycelial fragmentation. "Blumeria graminis" asexually produced conidia and sexually formed ascospores. Asexual reproduction may occur through vegetative reproductive spores, the conidia. "Diplocarpon rosae" over seasons as mycelia, ascospores, and conidia in infected leaves and canes. It occurs through vegetative reproductive spores, the conidia. As a result, this pathogen propagates itself via asexual spores called conidia. The disease spreads by wind born dispersal of ascospores and rain splash of conidia. This honeydew contains millions of asexual spores (conidia), which insects disperse to other florets. These two are some of the specialized hyphae that are formed by fungal conidia. Such individuals are usually exposed to organic dust heavily packed with conidia and mycelial debris. Germination occurs both extracellularly or in type II pneumocyte endosomes containing conidia. Alveolar macrophages phagocytize and destroy conidia within their phagosomes. A variety of cells can be formed from the germinating conidia. Under a compound microscope conidia appear ovoid in shape. Inhaled conidia that evade host immune destruction are the progenitors of invasive disease.