Shoemaker, R.A.; Babcock, C.E.; Irwin, J.A.G. 1991: Massarina walkeri n. sp., the teleomorph of Acrocalymma medicaginis from Medicago sativa contrasted with Leptosphaeria pratensis, L. weimeri n. sp., and L. viridella. Canadian Journal of Botany 69(3): 569-573.
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Shoemaker, R.A.; Babcock, C.E.; Irwin, J.A.G. 1991: Massarina walkeri n. sp., the teleomorph of Acrocalymma medicaginis from Medicago sativa contrasted with Leptosphaeria pratensis, L. weimeri n. sp., and L. viridella. Canadian Journal of Botany 69(3): 569-573.