The present invention provides improved fungal strains. In some embodiments, the improved fungal strains find use in hydrolyzing cellulosic material to glucose. The present invention also provides a fungal cell that has been genetically modified to reduce the amount of endogenous cellobiose dehydrogenase activity that is secreted by the cell, wherein the fungal cell is from the family Chaetomiaceae, wherein said cell comprises a deletion in the cellobiose dehydrogenase 1 (cdhl) gene.
