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Mean biomass production (± s.e.; n = 4) of Caladenia flava isolates after 20 d, Diuris corymbosa isolates after 18 d, Drakaea elastica isolates after 28 d and Pterostylis recurva isolates after 8 d in liquid media containing 12 different N sources. Letters above columns indicate significant differences (P < 0·05); ng, no growth.
