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The seasonality of Glomus fasciculatum associated with Bouteloua gracilis and Pascopyrum smithii was contrasted in the field, as well as the effects of this vesicular-arbuscular mycorrhizal (VAM) fungus on physiological parameters of these grasses in the greenhouse Arbuscule formation was earlier in P smithii, which has C3 photophysiology, than in the C1 B gracilis Soil spore densities were highest in fall samples of both grasses Both grasses exhibited lower stomatal resistance and increased photosynthesis with VAM formation, but these changes were 36% greater for B gracilis B gracilis has a greater percentage of VAM infection than P smithii in the field, but % of the root length infected in the two grasses was...