M.gypseum has septate hyphae along which sessile or stalked clavate (club shaped) microconidia (3 – 8 µm X 2 -3 µm) may be found. The fusiform (spindle shaped) macroconidia (8 – 15 µm X 22 – 60 µm) are relatively thin walled, verrucose (with bumpy surface) and contain about 3 – 6 internal cells. M. gypseum’s macroconidia has a rounded apical end while the base is truncated and may show an annular frill. They are usually produced in great numbers. This differentiates M.gypseum’s macroconidia from the M.canis macroconidia which has rather pointed ends and the rather rare & distorted macroconidia produced by M.audounii.