Pirozynski, K.A.; Shoemaker, R.A. 1970: Seimatosporium leaf spot of Ledum and Rhododendron. Canadian Journal of Botany 48: 2199-2203.
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| Pirozynski, K.A.; Shoemaker, R.A. 1970: Seimatosporium leaf spot of Ledum and Rhododendron. Canadian Journal of Botany 48: 2199-2203. |