SUMMARYGravity appears to induce bi-directional growth from germinating spores of the phycomycetous endomycorrhizal fungus Gigaspora margarita. Germ tubes grow upward and secondary branched hyphae grow downward. Echinulate vesicle clusters are produced on the branched hyphae.
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Watrud et al. (1978) studied this question.
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