(top) Mycelium of the pathogen Phytophthora parasitica var. nicotianae on which are formed a number of vegetative organs for reproduction, sporangia and chlamydospores. The mycelium is built of no septate, transparent hyphae with granular structure. (bottom) Chlamydospores of Phytophthora parasitica var. nicotianae. These are vegetative spores that are largely formed in the infected tissues of the plant. The fungus form intercalary along the hyphae or terminal, they have round shape, yellow to brown color and a different size. Their function is to maintain the pathogen in adverse conditions.