Cultural and microscopic aspect of the fungus. A) Fungal culture. The whitish, woolly or cottony aspect of the colonies is evident. The colony raises 1.5 cm high. B) Microscopic aspect of sporangia, pyriform with a conical-shaped columella (indicated by arrow) and pronounced apophysis (Cotton Blue stain, magnification ×400). C) Nonseptate hyphae arising in groups of three at the internode (arrow, magnification ×400). D) Ellipsoidal sporangiospores (magnification ×1000).