Walker, C., Pfeiffer, C.M. & Bloss, H.E., 1986. Acaulospora delicata sp. nov. an endomycorrhizal fungus from Arizona. Mycotaxon 25 (2): 621-628.
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Pfeiffer, C.M., Walker, C. & Bloss, E., 1996. Glomus spurcum, a new endomycorrhizal fungus from Arizona. Mycotaxon 59: 373-382.
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