(a) Thick-walled, multilocular pycnidium. PAS stain. Magnification, ×230. (b) Thick-walled, immersed pycnidium with conidiogenous cells lining the cavity. PAS stain. Magnification, ×430. (c) Thick-walled, multilocular pycnidium. PAS stain. Magnification, ×360.