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Influence of two Glomus species on haustorium initiation and differentiation in Pedicularis tricolor in expt 1. (A) Total number of haustoria per gram of dry root. (B) Presumably functional haustoria (PFH) per gram of dry root. Data are presented as the mean ± s.e. of six replicate pots. Different letters indicate a statistically significant difference at the P < 0·05 level.
