Fig. 10. Growth of S. chartarum along the base of gypsum wall board (covering the insulation on a concrete wall) inside of a ventilation tunnel around the base of an elementary school. Notice the black areas at the base of the right side wall. The spores were being drawn up into the classrooms, thus the entire gypsum wall board had to be replaced and the tunnel sanitized. The tunnel was flooded to about 6 inches deep

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