2 of penicillin g and having ph 5 6 additionally incorporating 4 u00d7 10 2 to 2 u00d7 10 5 of tolnaftate and incubated at 30 u00b0 c the tolnaftate resistant mutant which grows is transferred onto a slant medium of the same composition and preserved thereon in the tolnaftate resistant mutant thus obtained a strain of enhanced cellulase producing ability is recognized in high frequency the suspensions of the cells of wild type and resistant mutant are spread on czapek agar media containing 4 u00d7 10 2 to 1 u00d7 10 2 of tolnaftate and cultured at 30 u00b0 c during the culture the resistant mutant shows comparatively satisfactory growth and the wild type shows absolutely no growth the present strain differs from acremonium cellulolyticus the parent in respect that it possesses resistance to tolnaftate and exhibits high glycanase activity thus it is recognized to be a novel mutant of acremonium cellulolyticus since this mutant simultaneously produces xylanase and cellulase similarly to its parent it has been named acremonium cellulolyticus tn this strain was deposited at fermentation research institute agency of industrial science amp technology ministry of international trade amp industry on oct 13 1984 under ferm p 7894 and was also deposited at the same institute in compliance with the budapest treaty on the same.